Revert resampling changes

[unknownbrackets]

I'm not really very interested in audio in general, but it seemed SAS was causing emulation bugs. Anyway, there are complaints (some of which I cannot reproduce or at least cannot hear), so let's just go back to nearest neighbor. Someone else can mess with it.

Fixes #5538, fixes #5550.

-[Unknown]

[hrydgard]

I'm against reverting it, overall the code is better than before. There's something subtle hiding in here though - I hear crackles in the "oooj" noise that loco rocos make when you join them, for example.

I am currently not all that available but will have more time in a week, and I'll take another look.

I don't feel that whatever glitches are in here are bad enough to be worth even a temporary revert until then, to be honest. Would be different if we had a big release coming up but we just did one so it won't be for a while.

[unknownbrackets]

Well, 3edebbf was not right because it reads ahead without using that sample later, so games like Final Fantasy Tactics that use lower grains (it uses 64) will lose correct pitch fast.

But I'm far from an audiophile, and as a rule I don't like messing with things when I can't really tell if it's right.

-[Unknown]

[solarmystic]

This pull request also "resolves" #5548 (comment) and #5538 (comment)

Before (scratchy SFX):-
https://www.mediafire.com/?3t0cg9877bd3461

After (smoother SFX):-
https://www.mediafire.com/?kvyo795hcykqmdd

[hrydgard]

Okay, okay, temporary revert it is. I'll just resurrect this stuff as a starting point later.