Synthesizing Comparable, for enums

[taylorswift]

@allevato

I'm less concerned about the associated value restriction because chances are if your enum has them, your comparison logic is going to involve something more than just the case anyway.

i think not having the associated values would be a huge loss,, i can think of lots of situations where you’d want to have associated values but not use them in comparison, for example you might want to associate ID numbers or metadata records