diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 00059617..77868c1c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,18 @@
-syntax:
+variables:
+  GIT_SUBMODULE_STRATEGY: recursive
+
+stages:
+  - check
+
+code-quality:
+  image: registry.gitlab.com/craigbarnes/dockerfiles/lua-testing
+  interruptible: true
+  stage: check
+  retry:
+    max: 2
+    when:
+      - runner_system_failure
+      - stuck_or_timeout_failure
   script:
-    - git submodule init
-    - git submodule sync
-    - git submodule update
-    - luac5.1 -s -p mods/*/*.lua
+      - luarocks install luacheck
+      - luacheck mods
diff --git a/.gitmodules b/.gitmodules
index 8f939c3b..fc6e0c6c 100755
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,67 +1,67 @@
 [submodule "mods/illuna"]
 	path = mods/illuna
-	url = https://git.tchncs.de/Illuna-Minetest/illuna.git
+	url = ../../Illuna-Minetest/illuna.git
 [submodule "mods/wine"]
 	path = mods/wine
 	url = https://notabug.org/TenPlus1/wine
 [submodule "mods/death_messages"]
 	path = mods/death_messages
-	url = https://git.tchncs.de/Illuna-Minetest/death_messages.git
+	url = ../../Illuna-Minetest/death_messages.git
 [submodule "mods/worldedit"]
 	path = mods/worldedit
 	url = https://github.com/Uberi/Minetest-WorldEdit
 [submodule "mods/xdecor"]
 	path = mods/xdecor
-	url = https://git.tchncs.de/Illuna-Minetest/xdecor.git
+	url = ../../Illuna-Minetest/xdecor.git
 [submodule "mods/wardrobe"]
 	path = mods/wardrobe
-	url = https://git.tchncs.de/Illuna-Minetest/wardrobe.git
+	url = ../../Illuna-Minetest/wardrobe.git
 [submodule "mods/ctravelnet"]
 	path = mods/ctravelnet
-	url = https://git.tchncs.de/Illuna-Minetest/ctravelnet.git
+	url = ../../Illuna-Minetest/ctravelnet.git
 [submodule "mods/cottages"]
 	path = mods/cottages
-	url = https://git.tchncs.de/Illuna-Minetest/cottages.git/
+	url = ../../Illuna-Minetest/cottages.git/
 [submodule "mods/bows"]
 	path = mods/bows
-	url = https://git.tchncs.de/Illuna-Minetest/bows
+	url = ../../Illuna-Minetest/bows
 	branch = master
 [submodule "mods/pkarcs"]
 	path = mods/pkarcs
-	url = https://git.tchncs.de/Illuna-Minetest/pkarcs
+	url = ../../Illuna-Minetest/pkarcs
 [submodule "mods/columnia"]
 	path = mods/columnia
-	url = https://git.tchncs.de/Illuna-Minetest/columnia
+	url = ../../Illuna-Minetest/columnia
 [submodule "mods/homedecor_modpack"]
 	path = mods/homedecor_modpack
-	url = https://git.tchncs.de/Illuna-Minetest/homedecor_modpack
+	url = ../../Illuna-Minetest/homedecor_modpack
 [submodule "mods/magical_potion"]
 	path = mods/magical_potion
-	url = https://git.tchncs.de/Illuna-Minetest/magical_potion
+	url = ../../Illuna-Minetest/magical_potion
 [submodule "mods/mtfoods"]
 	path = mods/mtfoods
 	url = https://github.com/Philipbenr/mtfoods
 [submodule "mods/mtcandy"]
 	path = mods/mtcandy
-	url = https://git.tchncs.de/Illuna-Minetest/mtcandy
+	url = ../../Illuna-Minetest/mtcandy
 [submodule "mods/teleport_potion"]
 	path = mods/teleport_potion
-	url = https://git.tchncs.de/Illuna-Minetest/teleport_potion
+	url = ../../Illuna-Minetest/teleport_potion
 [submodule "mods/halloween_mobs"]
 	path = mods/halloween_mobs
-	url = https://git.tchncs.de/Illuna-Minetest/halloween_mobs
+	url = ../../Illuna-Minetest/halloween_mobs
 [submodule "mods/ethereal"]
 	path = mods/ethereal
-	url = https://git.tchncs.de/Illuna-Minetest/ethereal
+	url = ../../Illuna-Minetest/ethereal
 [submodule "mods/technic"]
 	path = mods/technic
-	url = https://git.tchncs.de/Illuna-Minetest/technic
+	url = ../../Illuna-Minetest/technic
 [submodule "mods/markers"]
 	path = mods/markers
 	url = https://github.com/Sokomine/markers
 [submodule "mods/golems"]
 	path = mods/golems
-	url = https://git.tchncs.de/Illuna-Minetest/golems
+	url = ../../Illuna-Minetest/golems
 [submodule "mods/princess"]
 	path = mods/princess
 	url = https://github.com/pithydon/princess
@@ -76,7 +76,7 @@
 	url = https://github.com/minetest-mods/character_creator
 [submodule "mods/illuna_ethereal"]
 	path = mods/illuna_ethereal
-	url = https://git.tchncs.de/Illuna-Minetest/illuna_ethereal
+	url = ../../Illuna-Minetest/illuna_ethereal
 [submodule "mods/bacon"]
 	path = mods/bacon
 	url = https://github.com/mootpoint/bacon
@@ -85,19 +85,19 @@
 	url = https://github.com/duane-r/geomoria
 [submodule "mods/integral"]
 	path = mods/integral
-	url = https://git.tchncs.de/Illuna-Minetest/integral
+	url = ../../Illuna-Minetest/integral
 [submodule "mods/illuna_extras"]
 	path = mods/illuna_extras
-	url = https://git.tchncs.de/Illuna-Minetest/illuna_extras
+	url = ../../Illuna-Minetest/illuna_extras
 [submodule "mods/underworlds"]
 	path = mods/underworlds
-	url = https://git.tchncs.de/Illuna-Minetest/underworlds
+	url = ../../Illuna-Minetest/underworlds
 [submodule "mods/caverealms"]
 	path = mods/caverealms
-	url = https://git.tchncs.de/Illuna-Minetest/caverealms
+	url = ../../Illuna-Minetest/caverealms
 [submodule "mods/fun_caves"]
 	path = mods/fun_caves
-	url = https://git.tchncs.de/Illuna-Minetest/fun_caves
+	url = ../../Illuna-Minetest/fun_caves
 [submodule "mods/hopper"]
 	path = mods/hopper
 	url = https://github.com/minetest-mods/hopper
@@ -121,7 +121,7 @@
 	url = https://github.com/minetest-mods/torches
 [submodule "mods/steel"]
 	path = mods/steel
-	url = https://git.tchncs.de/Illuna-Minetest/steel
+	url = ../../Illuna-Minetest/steel
 [submodule "mods/replacer"]
 	path = mods/replacer
 	url = https://github.com/Sokomine/replacer
@@ -133,13 +133,13 @@
 	url = https://github.com/SmallJoker/names_per_ip
 [submodule "mods/mobs_more_monsters"]
 	path = mods/mobs_more_monsters
-	url = https://git.tchncs.de/Illuna-Minetest/mobs_more_monsters
+	url = ../../Illuna-Minetest/mobs_more_monsters
 [submodule "mods/moreores"]
 	path = mods/moreores
-	url = https://git.tchncs.de/Illuna-Minetest/moreores
+	url = ../../Illuna-Minetest/moreores
 [submodule "mods/wiki"]
 	path = mods/wiki
-	url = https://git.tchncs.de/Illuna-Minetest/wiki
+	url = ../../Illuna-Minetest/wiki
 [submodule "mods/mg_villages"]
 	path = mods/mg_villages
 	url = https://github.com/Sokomine/mg_villages
@@ -148,7 +148,7 @@
 	url = https://github.com/Sokomine/handle_schematics
 [submodule "mods/unified_inventory"]
 	path = mods/unified_inventory
-	url = https://git.tchncs.de/Illuna-Minetest/unified_inventory
+	url = ../../Illuna-Minetest/unified_inventory
 [submodule "modpacks/mydoors"]
 	path = modpacks/mydoors
 	url = https://github.com/minetest-mods/mydoors
@@ -157,55 +157,55 @@
 	url = https://github.com/SmallJoker/sneak_glitch
 [submodule "mods/mycastle"]
 	path = mods/mycastle
-	url = https://git.tchncs.de/Illuna-Minetest/mycastle
+	url = ../../Illuna-Minetest/mycastle
 [submodule "mods/mesecons"]
 	path = mods/mesecons
-	url = https://git.tchncs.de/Illuna-Minetest/mesecons
+	url = ../../Illuna-Minetest/mesecons
 [submodule "mods/other_worlds"]
 	path = mods/other_worlds
-	url = https://git.tchncs.de/Illuna-Minetest/other_worlds
+	url = ../../Illuna-Minetest/other_worlds
 [submodule "mods/loud_walking"]
 	path = mods/loud_walking
-	url = https://git.tchncs.de/Illuna-Minetest/loud_walking
+	url = ../../Illuna-Minetest/loud_walking
 [submodule "mods/playerskins"]
 	path = mods/playerskins
-	url = https://git.tchncs.de/Illuna-Minetest/playerskins
+	url = ../../Illuna-Minetest/playerskins
 [submodule "mods/dmobs"]
 	path = mods/dmobs
-	url = https://git.tchncs.de/Illuna-Minetest/dmobs
+	url = ../../Illuna-Minetest/dmobs
 [submodule "mods/mobs_animal"]
 	path = mods/mobs_animal
-	url = https://git.tchncs.de/Illuna-Minetest/mobs_animal
+	url = ../../Illuna-Minetest/mobs_animal
 [submodule "mods/mobs_monster"]
 	path = mods/mobs_monster
-	url = https://git.tchncs.de/Illuna-Minetest/mobs_monster
+	url = ../../Illuna-Minetest/mobs_monster
 [submodule "mods/mobs_redo"]
 	path = mods/mobs_redo
-	url = https://git.tchncs.de/Illuna-Minetest/mobs_redo
+	url = ../../Illuna-Minetest/mobs_redo
 [submodule "mods/basic_robot"]
 	path = mods/basic_robot
-	url = https://git.tchncs.de/Illuna-Minetest/basic_robot
+	url = ../../Illuna-Minetest/basic_robot
 [submodule "mods/irc"]
 	path = mods/irc
-	url = https://git.tchncs.de/Illuna-Minetest/irc
+	url = ../../Illuna-Minetest/irc
 [submodule "mods/playereffects"]
 	path = mods/playereffects
-	url = https://git.tchncs.de/Illuna-Minetest/playereffects
+	url = ../../Illuna-Minetest/playereffects
 [submodule "mods/chat3"]
 	path = mods/chat3
-	url = https://git.tchncs.de/Illuna-Minetest/chat3
+	url = ../../Illuna-Minetest/chat3
 [submodule "mods/protector"]
 	path = mods/protector
-	url = https://git.tchncs.de/Illuna-Minetest/protector
+	url = ../../Illuna-Minetest/protector
 [submodule "mods/illuna_costumes"]
 	path = mods/illuna_costumes
-	url = https://git.tchncs.de/Illuna-Minetest/illuna_costumes
+	url = ../../Illuna-Minetest/illuna_costumes
 [submodule "mods/areas"]
 	path = mods/areas
-	url = https://git.tchncs.de/Illuna-Minetest/areas
+	url = ../../Illuna-Minetest/areas
 [submodule "mods/3d_armor"]
 	path = mods/3d_armor
-	url = https://git.tchncs.de/Illuna-Minetest/3d_armor
+	url = ../../Illuna-Minetest/3d_armor
 [submodule "mods/technic_armor"]
 	path = mods/technic_armor
 	url = https://github.com/stujones11/technic_armor
@@ -217,34 +217,34 @@
 	url = https://github.com/minetest-mods/player_monoids
 [submodule "mods/mob_horse"]
 	path = mods/mob_horse
-	url = https://git.tchncs.de/Illuna-Minetest/mob_horse
+	url = ../../Illuna-Minetest/mob_horse
 [submodule "mods/matrix"]
 	path = mods/matrix
 	url = https://github.com/entuland/lua-matrix
 [submodule "mods/rhotator"]
 	path = mods/rhotator
-	url = https://git.tchncs.de/Illuna-Minetest/rhotator
+	url = ../../Illuna-Minetest/rhotator
 [submodule "mods/pipeworks"]
 	path = mods/pipeworks
 	url = https://gitlab.com/VanessaE/pipeworks
 [submodule "mods/sea"]
 	path = mods/sea
-	url = https://git.tchncs.de/Illuna-Minetest/minetest-mod-sea
+	url = ../../Illuna-Minetest/minetest-mod-sea
 [submodule "mods/xban2"]
 	path = mods/xban2
 	url = https://github.com/minetest-mods/xban2
 [submodule "mods/chakram"]
 	path = mods/chakram
-	url = https://git.tchncs.de/Illuna-Minetest/chakram
+	url = ../../Illuna-Minetest/chakram
 [submodule "mods/hangglider"]
 	path = mods/hangglider
-	url = https://git.tchncs.de/Illuna-Minetest/minetest-hangglider
+	url = ../../Illuna-Minetest/minetest-hangglider
 [submodule "mods/hangglider_regular"]
 	path = mods/hangglider_regular
-	url = https://git.tchncs.de/Illuna-Minetest/minetest-hangglider-regular
+	url = ../../Illuna-Minetest/minetest-hangglider-regular
 [submodule "mods/illuna_events"]
 	path = mods/illuna_events
-	url = https://git.tchncs.de/Illuna-Minetest/illuna_events.git
+	url = ../../Illuna-Minetest/illuna_events.git
 [submodule "mods/eventkeys"]
 	path = mods/eventkeys
 	url = https://github.com/auouymous/eventkeys
@@ -274,13 +274,13 @@
 	url = https://gitlab.com/VanessaE/biome_lib
 [submodule "mods/bitchange"]
 	path = mods/bitchange
-	url = https://git.tchncs.de/Illuna-Minetest/bitchange
+	url = ../../Illuna-Minetest/bitchange
 [submodule "mods/bridges"]
 	path = mods/bridges
 	url = https://github.com/Sokomine/bridges
 [submodule "mods/christmas_craft"]
 	path = mods/christmas_craft
-	url = https://git.tchncs.de/Illuna-Minetest/christmas_craft
+	url = ../../Illuna-Minetest/christmas_craft
 [submodule "mods/maptools"]
 	path = mods/maptools
 	url = https://github.com/calinou/maptools
@@ -292,10 +292,10 @@
 	url = https://github.com/Sokomine/mobf_trader
 [submodule "mods/spawners"]
 	path = mods/spawners
-	url = https://git.tchncs.de/Illuna-Minetest/spawners
+	url = ../../Illuna-Minetest/spawners
 [submodule "mods/skybox"]
 	path = mods/skybox
-	url = https://git.tchncs.de/Illuna-Minetest/skybox
+	url = ../../Illuna-Minetest/skybox
 [submodule "mods/moreglass"]
 	path = mods/moreglass
 	url = ssh://git@git.tchncs.de:2241/Illuna-Minetest/moreglass.git
diff --git a/.luacheckrc b/.luacheckrc
index 2be56e80..72c7582f 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -1,27 +1,60 @@
-unused_args = false
-allow_defined_top = true
+ignore = {
+	-- list taken from https://stackoverflow.com/questions/49158143/how-to-ignore-luacheck-warnings/49160695#56618022 as
+	-- all the third party mods would be hard to manage otherwise
 
-read_globals = {
-	"DIR_DELIM",
-	"minetest",
-	"dump",
-	"vector",
-	"VoxelManip", "VoxelArea",
-	"PseudoRandom", "PcgRandom",
-	"ItemStack",
-	"Settings",
-	"unpack",
-	-- Silence errors about custom table methods.
-	table = { fields = { "copy", "indexof" } },
-	-- Silence warnings about accessing undefined fields of global 'math'
-	math = { fields = { "sign" } }
+    --"011", -- A syntax error.
+    --"021", -- An invalid inline option.
+    "022", -- An unpaired inline push directive.
+    "023", -- An unpaired inline pop directive.
+    "111", -- Setting an undefined global variable.
+    "112", -- Mutating an undefined global variable.
+    "113", -- Accessing an undefined global variable.
+    "121", -- Setting a read-only global variable.
+    "122", -- Setting a read-only field of a global variable.
+    "131", -- Unused implicitly defined global variable.
+    "142", -- Setting an undefined field of a global variable.
+    "143", -- Accessing an undefined field of a global variable.
+    "211", -- Unused local variable.
+    "212", -- Unused argument.
+    "213", -- Unused loop variable.
+    "221", -- Local variable is accessed but never set.
+    "231", -- Local variable is set but never accessed.
+    "232", -- An argument is set but never accessed.
+    "233", -- Loop variable is set but never accessed.
+    "241", -- Local variable is mutated but never accessed.
+    "311", -- Value assigned to a local variable is unused.
+    "312", -- Value of an argument is unused.
+    "313", -- Value of a loop variable is unused.
+    "314", -- Value of a field in a table literal is unused.
+    "321", -- Accessing uninitialized local variable.
+    "331", -- Value assigned to a local variable is mutated but never accessed.
+    "341", -- Mutating uninitialized local variable.
+    "411", -- Redefining a local variable.
+    "412", -- Redefining an argument.
+    "413", -- Redefining a loop variable.
+    "421", -- Shadowing a local variable.
+    "422", -- Shadowing an argument.
+    "423", -- Shadowing a loop variable.
+    "431", -- Shadowing an upvalue.
+    "432", -- Shadowing an upvalue argument.
+    "433", -- Shadowing an upvalue loop variable.
+    "511", -- Unreachable code.
+    "512", -- Loop can be executed at most once.
+    "521", -- Unused label.
+    "531", -- Left-hand side of an assignment is too short.
+    "532", -- Left-hand side of an assignment is too long.
+    "541", -- An empty do end block.
+    "542", -- An empty if branch.
+    "551", -- An empty statement.
+    "561", -- Cyclomatic complexity of a function is too high.
+    "571", -- A numeric for loop goes from #(expr) down to 1 or less without negative step.
+    "611", -- A line consists of nothing but whitespace.
+    "612", -- A line contains trailing whitespace.
+    "613", -- Trailing whitespace in a string.
+    "614", -- Trailing whitespace in a comment.
+    "621", -- Inconsistent indentation (SPACE followed by TAB).
+    "631", -- Line is too long.
 }
 
--- Overwrites minetest.handle_node_drops
-files["mods/creative/init.lua"].globals = { "minetest" }
 
--- Overwrites minetest.calculate_knockback
-files["mods/player_api/api.lua"].globals = { "minetest" }
 
--- Don't report on legacy definitions of globals.
-files["mods/default/legacy.lua"].global = false