Remove 'default dependency

Make the 'default' dependency optional

This commit introduces compatibility functions needed by the
3d_armor mods to adapt to the game that is being used.

Added license information to LICENSE.md in the modpack folder.

Co-authored-by: Sheriff U3 <210896603+Sheriff-Unit-3@users.noreply.github.com>

3d_armor/gamecompat.lua

@@ -0,0 +1,41 @@
+-- 3d_armor defaults to support unknown games
+local sounds = {
+	wood = {
+		footstep = { name = "armor_wood_walk", gain = 0.5 },
+		dig = { name = "armor_wood_dig", gain = 0.5 },
+		dug = { name = "armor_wood_walk", gain = 0.5 }
+	},
+	metal = {
+		dig = { name = "armor_metal_dig", gain = 0.5 },
+		dug = { name = "armor_metal_break", gain = 0.5 },
+	},
+	glass = {
+		dig = { name = "armor_glass_hit", gain = 0.5 },
+		dug = { name = "armor_glass_break", gain = 0.5 },
+	},
+}
+
+local formspec_list_template = "list[%s;%s;%f,%f;%f,%f;%s]"
+-- Allow custom slot styling
+armor.add_formspec_list = function(location, listname, x, y, w, h, offset)
+	return formspec_list_template:format(location, listname, x, y, w, h, tostring(offset) or "")
+end
+
+
+if core.get_modpath("default") then
+	sounds = {
+		wood  = default.node_sound_wood_defaults(),
+		metal = default.node_sound_metal_defaults(),
+		glass = default.node_sound_glass_defaults(),
+	}
+	-- armor.add_formspec_list : use formspec prepends for styling
+end
+
+
+-- Sanity checks
+for name, def in pairs(sounds) do
+	assert(type(def) == "table", "Incorrect registration of sound " .. name)
+end
+
+
+armor.sounds = sounds