Proposal + Bikeshed: Rename C-like Enumeration

[hanna-kruppe]

@kornel

The gotchas with #[repr(C)] are real though. Maybe instead of changing the name, the UB should be removed instead? (i.e. a C-like enum with #[repr(C)] should really behave more like C).

I don't see a realistic way to achieve that, but in any case that would be an entirely different discussion (e.g., C-style enums in FFI (and a proposal to lump in with unions))