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This PR implements a color and opacity selector for the settings menu and app drawer icons, and also uses the app drawer icon color for the buttons in the Music app. It's based on the PTS color picker code, which I think is fairly well tested by now, and adds about 1.5kB to the overall firmware size.
The opacity is stored as an integer, 51,102,153,204,255, rather than LV_OPA values, but they line up exactly so it didn't seem worth the effort of complicating it further. Black and white are skipped in the color selection to avoid confusion/invisible buttons/text.