Framebuffer manager refactor: Don't cache framebuffer information in TexCacheEntry

[hrydgard]

Instead, re-evaluate framebuffers every time we try to bind a texture and it doesn't find an entry in the texcache map.

This is not that many times per frame normally, so it's really not as bad as it seems. Plus, the code becomes a lot more readable and debuggable without having to take into account all that state.

Even difficult cases like Test Drive and God Of War's shadows work just fine.

Now, this is a draft PR because Breath of Fire III is broken yet again (oops - we lost the detach actions again but since we re-evaluate every time now, that should be ok) but all should be fixable with a little bit of work. And when it's done, it'll be much easier to work on these issues. (UPDATE: fixed)

[hrydgard]

Added some stats, Test Drive ends up looping through the framebuffers ("evaluates") 96 times per frame, most other games much fewer. I think the possible tiny perf hit is worth the code size and complexity reduction here.

[hrydgard]

Made the requested improvements :) The match enum is now pretty much a boolean.

[hrydgard]

Tested through the usual suspects, everything works.

[DonelBueno]

This PR makes texture load extremely sluggish on all backends.

I don't have a compiler, so I don't know which commit caused it, but from the builds offered by the buildbot, v1.10.3-650-g2b49c3e46 is the last working one and v1.10.3-661-ga6084f6fe is the first problematic build.

Running Windows 10 x64 and Geforce GTX 1070 with the latest drivers.

[hrydgard]

@DonelBueno After 692, the worst issues should be fixed, but yes, there are still some problems. I'm working on it and I'm confident we can get it as fast as it used to be, at least.

[DonelBueno]

An option to preload custom textures would also be very nice.