Implement mipmap clut sharing/not sharing.

It was kinda already there, probably from JPCSP.  Not well tested,
but this is what JPCSP does and it makes sense.
Move the font clut opt check to clut load.

And remove the report for mipmap sharing, seems to work...
Don't double alpha when alphablend is disabled.

Probably doesn't affect much.
Add reporting for unsupported GE commands.

And clean up some disasm for a couple others.
Defer palette conversion after clut load.

Because the format can easily be specified afterward.
Only report these once to avoid spam.
Merge pull request #1787 from unknownbrackets/gpu-minor

Misc. GE changes and CLUT fix