[ETF] Entity Texture Features

fixed a possible recursion crash with the config

• fixed 3d skin layers mod & etf skin feature, compat for the 1.6 update (also removed log warning spam for future changes to 3d skin layers).
• restructured the config
• generified the emissive and enchanted pixel rendering methods
• the mini entities in mob spawners UUID's should now always use the following format in nbt ("[I;?,?,12345,12345]") making them identifiable for randomisation, the blocks property should also return the actual mob spawner block.