Add additional automatic derives for SyncType and UsageType

[raphaelcohn]

These types lack some ordering derives. Whilst it might seem odd to some, having a comparison implementation on these types means they can have a consist sort order when being displayed. It might also be nice to implement the Display trait, perhaps using strum.

[a1ien]

I can add ordering derive but I don't like add more dependency. I want keep crate minimal as possible. If implement Display its can be easily done by manual implementation.

[raphaelcohn]

Ok, I can understand not adding a dependency on strum.