* update shaders that use Original to use a reference pass instead for append/prepend readiness
* remove some extraneous files
* fix super-xbr preset that was already broken apparently
- Swap stock linear by cubic multipass shaders.
- Improves IQ for 4xSoft, 2xSaL, 2xSacaleHq, 4xScaleHq, HQ2x, HQ3x, HQ4x, 2xBRz, 2xSaI, Super-2xSaI and Advance2x-AA.