ea73e4f1e9
- clean out unused colors; add desaturated light color - remove long unused drawing functions; add high contrast color mixin - de-duplicate and move common colors to a default-colors stylesheet - rework how HighContrast is defined; clean up HC cruft - bring over named color defines and other colors from libadwaita - change how panel colors are defined Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3097>