[Task] Provide SSAA as an alternative anti-aliasing solution

[kd-11]

We have limited control over how GPU drivers implement MSAA. This means the hardware can be incompatible with what we want to get out as an emulator (basically perfectly aligned grid with full-rate sample shading).
SSAA can offer up a better solution by allowing us to perfectly emulate the sample patterns and also avoids the somewhat blurry 6-tap filter used to emulate MSAA texture filtering in software.