Since we have several accessibility-related selectors, it makes sense to collect them in one stylesheet. https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/938
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/904
- split _common.scss into widgets - improve _drawing functions - minify SVG assets https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/904