* Added options to add or remove mobs from specific biomes.
* For adding mobs, users should specify mob ID, biome ID, and mob spawning information.
* For removing mobs, users should specify mob ID and biome ID.
* Entries can be added manually to 'mobSpawnAdditions' or 'mobSpawnRemovals' in the config file, but using Mod Menu is highly recommended (for single-player worlds).

IMPORTANT: Please update to the latest version of Cloth Config, which fixes an issue with complex lists saving.