solver3: Reject reverse dependencies natively

Instead of utilizing the reverse depends functionality of the cache
and marking all possible reverse dependencies for removal, mark them
ourselves by keeping track of reverse-implication-clauses.

Notably, this improves the reverse dependency rejection substantially:
The previous RejectReverseDependencies() function did not handle
Provides.

For this to work correctly right now, we need to discover optional
clauses too when queuing them. This is somewhat suboptimal as we
technically we don't care if they become unsat, we just waste time
tracking them.

The tests get a bit awkward, but oh well, we use what we can
use.

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