Add mods: technic, moreores, paintings, Nyancat (Pbj_pup). Small fix: sandwiches

mods/xcompat/init.lua

@@ -0,0 +1,51 @@
+local modpath = minetest.get_modpath("xcompat")
+
+xcompat = {
+    modpath = modpath,
+}
+
+xcompat.gameid = dofile(modpath .. "/src/gameid.lua")
+xcompat.utilities = dofile(modpath .. "/src/utilities.lua")
+
+xcompat.sounds = dofile(modpath .. "/src/sounds.lua")
+xcompat.materials = dofile(modpath .. "/src/materials.lua")
+xcompat.textures = dofile(modpath .. "/src/textures.lua")
+xcompat.functions = dofile(modpath .. "/src/functions.lua")
+xcompat.player = dofile(modpath .. "/src/player.lua")
+
+local function validate_sound(key)
+    if key and xcompat.sounds[key] then
+        return true
+    elseif key then
+        minetest.log("warning", "attempted to call invalid sound: "..key)
+    else
+        minetest.log("warning", "sound_def is missing a sound_api key")
+    end
+    return false
+end
+
+minetest.register_on_mods_loaded(function()
+    for name, def in pairs(minetest.registered_nodes) do
+        if def._sound_def and validate_sound(def._sound_def.key) then
+            minetest.override_item(name, {
+                sounds = xcompat.sounds[def._sound_def.key](def._sound_def.input)
+            })
+        end
+    end
+
+    local old_reg_node = minetest.register_node
+    function minetest.register_node(name, def)
+        if def._sound_def and validate_sound(def._sound_def.key) then
+            def.sounds = xcompat.sounds[def._sound_def.key](def._sound_def.input)
+        end
+
+        old_reg_node(name, def)
+    end
+end)
+
+dofile(modpath .. "/src/commands.lua")
+
+if minetest.get_modpath("mtt") and mtt.enabled then
+    -- register tests
+    dofile(modpath .. "/mtt.lua")
+end