* Add Retro-Tiles shaders
A shader designed for handheld and low res systems. It turns pixels into crisp tiles.
* Add box scaling
- Turn mandatory integer scaling;
- Add Overscan option.
* Fix gamma on retro-tiles shader
- Increased gamma from 2.2 to 2.7 for a better white balance.
* Add Gamma Slider to checkerboard-dedither
- Add Gamma Slider to checkerboard-dedither.
* Update checkerboard-dedither shaders
- Add new pattern recognitions;
- Add new option to mitigate false positives.