Feature/enum extensions (#2602 ) * New: Support `@Shadow` constructors. Will be introduced in FabricMixin along with enum extensions. We don't need to bother checking whether the feature is supported on the current Mixin, because the user will already get a compile error about Shadow not being applicable to constructors. * New: Support Enum extensions. ⁠ llamalad7 5 files  a3426c1d38d8 02 Apr 26 19:00