Added Cleanroom / MixinBooter support

Note: When using Cleanroom, MixinBooter or any other Mixin library mods, please use the 'Thin' jar as that excludes the Mixin library which may cause conflicts.

Additional Files

• Thin: Excludes Mixin dependency. (For resolving Mixin version conflicts)
• Sponge: Excludes Configurate & Mixin dependencies. (For servers running Sponge)