Merge pull request #1 from aliaspider/master

fix sprite priority in 16bpp mode
Don't go through redundant systemColorMap - we're not going to do
custom palettes anyway
Get rid of ColorMap stuff
hw_video/huc6270 not used
Hardcode ALPHA_MASK for 16bpp
Take out externs for ColorMap in libretro.cpp
Take out hw_cpu - not needed either
Remove hw_sound
Can take out SCSI CD too
Remove CDAccess_Physical
Remove 'hack for the input latency reduction hack'
DecodeColor never used - get rid of it
vpc_mix_inner - change uint32 pixels to uint16
psp tests