add editorconfig and luacheck with github workflows

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+indent_size = 4
+indent_style = tab
+trim_trailing_whitespace = true
+
+[{locale/template,locale/*.tr}]
+end_of_line = lf

.github/workflows/luacheck.yml

@@ -0,0 +1,20 @@
+name: Luacheck
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@master
+
+    - name: Install Luarocks
+      run: |
+        sudo apt-get update -qyy
+        sudo apt-get install luarocks -qyy
+
+    - name: Install Luacheck
+      run: luarocks install --local luacheck
+
+    - name: Run Luacheck
+      run: $HOME/.luarocks/bin/luacheck ./

.luacheckrc

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+unused_args = false
+
+globals = {
+	"basic_machines"
+}
+
+read_globals = {
+	"ItemStack",
+	"default",
+	"farming",
+	"machines",
+	"minetest",
+	"player_monoids",
+	"unified_inventory",
+	"vector",
+	table = {fields = {"copy"}}
+}
+
+files["ball.lua"] = {globals = {"boneworld.killxp"}}
+files["grinder.lua"] = {read_globals = {"i3"}}
+files["keypad.lua"] = {read_globals = {"signs_lib"}}
+files["machines_configuration.lua"] = {max_line_length = 190}
+files["mark.lua"] = {globals = {"machines"}}
+files["mesecon_adapter.lua"] = {read_globals = {"mesecon"}}
+files["mover.lua"] = {max_line_length = 290, read_globals = {"bucket", "nodeupdate"}}
+files["protect.lua"] = {globals = {"minetest.is_protected"}}
+files["technic_power.lua"] = {max_line_length = 140}