[_misc] Add sand swapping recipes (desert sand <-> sand)

mods/_misc/init.lua

@@ -27,3 +27,6 @@ dofile(minetest.get_modpath("_misc").."/uncraft_woll.lua")
 
 -- List players
 dofile(minetest.get_modpath("_misc").."/list_players.lua")
+
+-- Desert Sand/Sand swap
+dofile(minetest.get_modpath("_misc").."/sand_swapping.lua")

mods/_misc/sand_swapping.lua

@@ -0,0 +1,13 @@
+-- Swap sands
+
+-- desert -> normal
+minetest.register_craft({
+	output = "default:sand",
+	recipe = {{"default:desert_sand"}}
+})
+
+-- normal -> desert
+minetest.register_craft({
+	output = "default:desert_sand",
+	recipe = {{"default:sand"}}
+})