AquaReal Shader - MakeUp UltraFast 9.5d feature port

Ported from MakeUp UltraFast 9.5d:
- CAS image sharpening
- Image sharpening toggle
- Sharpen strength setting (0.1 - 1.0, default 0.5)
- Post Processing UI entry

The sharpening feature is OFF by default.
Existing AquaReal effects and shader systems were left intact.
