Spawner Drops Loot

• Better check code for obfuscated environment, previous one ended up crashing for absolutely no reason
• Field/method access init code is now only called once, not every call
• Put some Block construction methods within PatchBlockMobSpawner instead of accessing them outside, dumb me
• Using MethodHandles.Lookup for faster method invoke (but the mod is forced to Java 8 and beyond, no support for 6-7 sorry)

Initial release.