Add new dirt and stone footstep sounds

CREDITS.md

@@ -84,6 +84,9 @@ Sounds:
 	- by Fourier <https://opengameart.org/content/forward-button-press-ui-sound>
 	- Edit by Wuzzy (shortened)
 	- License: CC BY 3.0
+- `lzr_sounds_footstep_stone.*.ogg`, `lzr_sounds_footstep_dirt.*.png`
+	- by Wuzzy
+	- License: MIT License
 - All other sounds come from Minetest Game (see license of Minetest Game 5.4.1 for details)
 
 Code:

mods/lzr_sounds/init.lua

@@ -14,22 +14,20 @@ end
 function lzr_sounds.node_sound_stone_defaults(table)
 	table = table or {}
 	table.footstep = table.footstep or
-			{name = "default_hard_footstep", gain = 0.3}
+			{name = "lzr_sounds_footstep_stone", gain = 0.9}
 	table.dug = table.dug or
-			{name = "default_hard_footstep", gain = 1.0}
+			{name = "lzr_sounds_footstep_stone", gain = 1.0}
 	lzr_sounds.node_sound_defaults(table)
 	return table
 end
 
--- TODO: sand
-lzr_sounds.node_sound_sand_defaults = lzr_sounds.node_sound_defaults
 -- TODO: leaves
 lzr_sounds.node_sound_leaves_defaults = lzr_sounds.node_sound_defaults
 
 function lzr_sounds.node_sound_dirt_defaults(table)
 	table = table or {}
 	table.footstep = table.footstep or
-			{name = "default_dirt_footstep", gain = 0.4}
+			{name = "default_dirt_footstep", gain = 0.6}
 	table.dug = table.dug or
 			{name = "default_dirt_footstep", gain = 1.0}
 	table.place = table.place or
@@ -38,6 +36,9 @@ function lzr_sounds.node_sound_dirt_defaults(table)
 	return table
 end
 
+-- TODO: sand
+lzr_sounds.node_sound_sand_defaults = lzr_sounds.node_sound_dirt_defaults
+
 function lzr_sounds.node_sound_wood_defaults(table)
 	table = table or {}
 	table.footstep = table.footstep or