GE debugger - fix some preview issues, softgpu stencil fix

Now the previews basically show properly for the GLES and software renderers.

Also, my tests so far have shown that e.g. INCR works for stencil, so the way the softgpu was doing stencil (forcing to one bit) just could not have been right.  Changed it to allow the full range.

Lastly, using 32-bit again I ran into more issues, I think this should solve the spurious wakes now.

-[Unknown]