ws: First pass at "mono" model color emulation. #1834
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asiekierka
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The "mono" WonderSwan has an FSTN display, same as the Game Boy Pocket and resulting in the same display hue. While there are more accurate palettes for FSTN displays available these days, I've decided to use Near's GBP palette for consistency. It also has sixteen shades of grey with a contrast slider; according to lidnariq, with the optimal contrast wheel setting, they follow a linear gamma of 1.0.
This PR adds color emulation to the "mono" WonderSwan under these assumptions; I am a little concerned that not every game expects the same contrast wheel setting, but I'd say it's good enough for a first pass. A proper second pass would require photographic documentation to create a more precise palette, probably.