Improve fullcolor Weather status icons
As Weather redesign is getting to a final stretch, we'll need the full color status icons to become part of Adwaita to cater for both Weather and the Shell itself. For both of the apps, the single scalable fullcolor would be enough, but we might need to provide at least the 24x24 toolbar variant for apps like Evolution. I'd prefer providing them to Evolution & co directly, but maybe somehow incorporate them into adwaita could work too.