Add Game Boy palette shader #139
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This was referenced Jan 26, 2018
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This is based on the shader that SigmaVirus posted on the libretro forums. (https://forums.libretro.com/t/game-boy-palette-color-changer-shader/14080)
I removed extraneous code that was in the original (and the motion blur stuff) and brought it to the current standards using the LUT shader as a base.
I have also ported the shader to GLSL and Slang specs.