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So, only use the type class for contractive functors.

Add both non-expansive and contractive functors, and bundle them for the general Iris instance as well as the global functor construction

This allows us to move the \later in the user-defined functor to any place we want.
In particular, we can now have "\later (iProp -> iProp)" in the ghost CMRA.

Since functor instances are just used as combinators, there is really
no need for functors that are not contractive.

This cleans up some ad-hoc stuff and prepares for a generalization
of saved propositions.

This replaces f_equiv and solve_proper with our own, hopefully better, versions

The performance gain seems neglectable, unfortunatelly...

This better seals off their definition. Although it did not give
much of a speedup, I think it is conceptually nicer.

this makes it slightlymore annoying to use because we have to elliminate the box. one more reason to have a proof mode ;-)

This avoids ambiguity with P and Q that we were using before for both
uPreds/iProps and indexed uPreds/iProps.

- The direction of big_sepS_later and big_sepM_later is now like later_sep.
- Do not use generated variables in the proofs.

This prevent the assumption from being dragged into lemmas that do not even need it