Open Source Algorithm of Simulating CRT Raster-Scanning (looking better than typical BFI) -- Special K integration

Could be a nice option to have in Special K.

More details and demonstration in Blur Busters' article: https://blurbusters.com/crt-simulation-in-a-gpu-shader-looks-better-than-bfi/

See also this discussion about BFI settings in Special K: https://github.com/SpecialKO/SpecialK/issues/31