audiocommon: remove 1:1 interpolation

The usual one is 32->48 khz interpolation. So there is no need in a special 1:1 interpolation only for performance.
audiocommon: sync mixer by fifo instead of estimate values
controll the interpolation frac by the fifo size
change AI sampling rate based on framelimit
x64: add support for some x87 instructions
Jit64[IL]: fix float conversions

Floating-point is complicated...

Some background: Denormals are floats that are too close to zero to be
stored in a normalized way (their exponent would need more bits). Since
they are stored unnormalized, they are hard to work with, even in
hardware.  That's why both PowerPC and SSE can be configured to operate
in faster but non-standard-conpliant modes in which these numbers are
simply rounded ('flushed') to zero.

Internally, we do the same as the PowerPC CPU and store all floats in
double format. This means that for loading and storing singles we need a
conversion. The PowerPC CPU does this in hardware. We previously did
this using CVTSS2SD/CVTSD2SS. Unfortunately, these instructions are
considered arithmetic and therefore flush denormals to zero if non-IEEE
mode is active. This normally wouldn't be a problem since the next
arithmetic floating-point instruction would do the same anyway but as it
turns out some games actually use floating-point instructions for
copying arbitrary data.

My idea for fixing this problem was to use x87 instructions since the
x87 FPU never supported flush-to-zero and thus doesn't mangle denormals.
However, there is one more problem to deal with: SNaNs are automatically
converted to QNaNs (by setting the most-significant bit of the
fraction). I opted to fix this by manually resetting the QNaN bit of all
values with all-1s exponent.
Interpreter: fix float conversions

Can't use simple casting, otherwise we get the same problems as in Jit64.
Re-enable non-IEEE mode support
x64Emitter: Add the xmm, xmm form of PSRLQ instruction.
x64Emitter: Fix the PSUBQ instruction's opcode
Interpeter: Fixed ConvertToDouble to match the manual.

Also added some documntation comments.
Disable framerate correction for OpenAL

OpenAL itself stretch the time on slowdowns, so the Mixer isn't allowed also to change the rate.
Kill off some silly casting in the FifoPlayer.

Also makes more sense conceptually, since it's not like we'll ever have negative frames.
Clean out some old left-behind quantizer stuff in Jit64/Jit_LoadStorePaired.cpp and Jit64/Jit_SystemRegisters.cpp.
Remove dead else branch in StoreFromRegister() in Jit64/JitRegCache.cpp
Remove #if 0 statement in lfd() in Jit64/Jit_LoadStoreFloating.cpp
Merge pull request #71 from lioncash/jit-cleanup

Remove unused code in the JIT recompiler.
Merge pull request #70 from lioncash/fifo-unsigned

Kill off some casting in the FifoPlayer.
Kill off some usages of the ArraySize macro.

This required the use of std::array in some cases.
move shared parts from VertexManager::vFlush into VideoCommon