Alternative framebuffer approach

This alternative framebuffer approach basically fixes all the following issues probably more however it only broken kingdom heart but no others.Probably we can do it as option ? i'm not sure.

Fixes https://github.com/hrydgard/ppsspp/issues/5506
Fixes https://github.com/hrydgard/ppsspp/issues/4472
Fixes https://github.com/hrydgard/ppsspp/issues/4325
Fixes https://github.com/hrydgard/ppsspp/issues/4112
(partial due to stencil uniform value)