* 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
* 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
* Initial implementation of the texture cache
* Cache vertex and index data aswell, some cleanup
* Improve handling of the cache by storing cached ranges on a list for each page
* Delete old data from the caches automatically, ensure that the cache is cleaned when the mapping/size changes, and some general cleanup
