Fix ids conflicts caused by some mods + remove outdated mixins

Mixins Added

• MixinEntityRegistry

Mixins Removed

• MixinEntityManager
• MixinEldritchEmpireRegistration
• MixinEntityChocolateCreeper
• MixinEntityRegistererOreSpiders
• MixinCommonProxyRunicDungeons
• MixinKMOD_Main_Entities
• MixinTooMuchTNT