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fca336c32d
This commit is quite large because it's fairly interconnected and can't be split up in a logical way. The main part of this commit is that alpha blending is now always done in the Display P3 color space, and depending on the configured `window-colorspace` colors will be converted from sRGB or assumed to already be Display P3 colors. In addition, a config option `text-blending` has been added which allows the user to configure linear blending (AKA "gamma correction"). Linear alpha blending also applies to images and makes custom shaders receive linear colors rather than sRGB. In addition, an experimental option has been added which corrects linear blending's tendency to make dark text look too thin and bright text look too thick. Essentially it's a correction curve on the alpha channel that depends on the luminance of the glyph being drawn.