Merged requested to merge wip/jimmac/app-icon-redesign into master
GNOME 3.32 redesign of app icons. See Initiatives#2 (closed) for more info.
No HC icons anymore, symbolics used for this.
Don't use fullcolor app icon as a watermark for empty state, fullcolor icons are meant to be activatable.
In the future we should aim at replacing the off style private icons installed into hicolor with private symbolics.