Support reversed buffer formats in the ge debugger.

So that it doesn't show garbage under the softgpu.
Detach the GE debugger on close.

And attach in a few missing places, clean up a few comments.
Add a some more defines for ELF values.

Mostly flags and stuff.
Add support for fpu and vfpu regs in expressions.

This way you can break based on the value.
Merge pull request #4562 from unknownbrackets/debugger

Minor GE debugger tweaks, fpu/vfpu expression support