CorviCraft Spawn Utility

Completely overhauled the JSON spawning config method. As the old method is extremely outdated, previous configs will need to be removed and the 1.0 files will be archived to prevent future use. 2.0+ is much more stable and expected to be the method used from here on out.

Corvicraft will now generate a folder for each applicable mod (corvicraftspawns handles Vanilla entries). In this folder is a subfolder named spawn_sets, within which a series of json pools are defined. Each file must have a unique name. These sets can then be paired with a list of biomes in the spawns.json file within the main mod folder. Separating the files like this makes them a little more resilient in regards to errors, as unless spawns.json itself is broken, only the invalid spawn pool file will fail to load.

Several additional ways to customize modded spawns have been added internally, although they do not impact vanilla entries.