Custom PPSSPP shaders

[LunaMoo]

@GeoMan redownload, I didn't tested all of them previously and assumed they all had only mistakes I found in two first I checked;p, that one had way more problems through. In addition to fixing it, I also made some other changes now, so just remove previous files and grab fresh ones if you want.
Debugging those problems is annoying since translation doesn't show any errors and GLSL is far too forgiving for bad/non standard code.:C