GROOVIE: Remove groovie2 8bpp mode

It didn't work properly, it's not what the original did, and spooky mode needs to be implemented completely differently
GROOVIE: Switch roq decoding to do YUV decoding on codebook load
GROOVIE: Fix various roq glitches

They should now all decode correctly
GROOVIE: Switch to 32bpp only in groovie2

Needed for alpha