This makes everything use floats for positions. On some hardware/drivers,
this may be faster. On some it may be slower. We'll need testing to see
the performance impact.
Fixes Final Fantasy 4's pos misalignments, and probably others (like
Tekken 5 I suspect.)
It's actually already pretty decent (unlike the softgpu), but there were a
few places it could use a bit of help. Speeds up things with hardware
transform off, or areas that need to use software transform.
The bezier/spline code will no longer need to handle morph and splines,
when it's finally written. This is done by pre-skinning in software and
pre-decoding to get rid of the morph.
