* Add multiple color outputs for fragment shaders
* Add registers and gal enums
* Use textures for framebuffers and split color and zeta framebuffers
* Abstract texture and framebuffer targets as an image
* Share images between framebuffers and textures
* Unstub formats
* Add some formats
* Disable multiple attachments
* Cache framebuffer attachments
* Handle format types
* Add some rendertarget formats
* Code cleanup
* Fixup half float types
* Address feedback
* Disable multiple attachments in shaders
* Add A4B4G4R4 image format
* Add reversed section for image enums
* Directly send host address to buffer data
* Cleanup OGLShader
* Directly copy vertex and index data too
* Revert shader bind "cache"
* Address feedback
* Implement stencil testing
* Implement depth testing
* Implement face culling
* Implement front face
* Comparison functions now take OGL enums too
* Fix front facing when flipping was used
* Add depth and stencil clear values
* Call OpenGL functions directly, remove the pfifo thread, some refactoring
* Fix PerformanceStatistics calculating the wrong host fps, remove wait event on PFIFO as this wasn't exactly was causing the freezes (may replace with an exception later)
* Organized the Gpu folder a bit more, renamed a few things, address PR feedback
* Make PerformanceStatistics thread safe
* Remove unused constant
* Use unlimited update rate for better pref
