GSP: Implement SetBufferSwap.
GSP: Update framebuffer information when necessary.
Pica: Add debug utility functions for dumping geometry data.
Pica: Add debug utilities for dumping shaders.
Pica/CommandProcessor: Implement parameter masking.
Pica/citra-qt: Replace command list view and command list debugging code with something more sophisticated.
Pica/VertexShader: Fix a bug in the bitfield definitions and add the "negate" field for swizzlers.
Pica/Math: Improved the design of the Vec2/Vec3/Vec4 classes and simplified rasterizer code accordingly.

- Swizzlers now return const objects so that things like "first_vec4.xyz() = some_vec3" now will fail to compile (ideally we should support some vector holding references to make this actually work).
- The methods "InsertBeforeX/Y/Z" and "Append" have been replaced by more versions of MakeVec, which now also supports building new vectors from vectors.
- Vector library now follows C++ type promotion rules (hence, the result of Vec2<u8> with another Vec2<u8> is now a Vec2<int>).
Pica: Add support for dumping textures.
Pica/Rasterizer: Add initial implementation of texture combiners.
Pica/DebugUtils: Add convenient tev setup printer.
Pica/Rasterizer: Add texturing support.
Pica: Consolidate the primitive assembly code in PrimitiveAssembly and GeometryDumper.