Bug 1554433 - Move system colors to values::specified::color. r=xidorn This should be an idempotent patch. The way to come up with this patch has been: * Run the first script attached to the bug and pipe it to xclip, then paste it in color.rs * Add the relevant #[derive] annotations and remove the color.mako.rs definition. * Reorder the values to match the ColorID definition, on which some widget prefs and caching stuff relies on. * Manually port some documentation from nsLookAndFeel.h * Run `rg 'eColorID_' | cut -d : -f 1 | sort | uniq >files` * Run the second script attached to the bug. * Manually fix usage of `LAST_COLOR` (adding the `End` variant), and adding casts to integer as needed. * Add an static assert so that people remember to update the prefs, rather than a comment on the definition :) Differential Revision: https://phabricator.services.mozilla.com/D32610

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