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This is backwards-compatible; it desugars to a normal application on previous versions

In same spirit as the other 'primitive' types like `option`, `prod`, ...

Rename `UCMRA` → `Ucmra`
Rename `CMRA` → `Cmra`
Rename `OFE` → `Ofe` (`Ofe` was already used partially, but many occurences were missing)
Rename `STS` → `Sts`
Rename `DRA` → `Dra`

That way, we can use Contractive as part of structure definitions in
which we do not have a bundled OFE yet.

Now, we never need to unfold LimitPreserving in LambdaRust, and hence
the entails_lim tactic is no longer needed.