0.2.3 - Completed monochrome functionality

linch app --monochrome Now works on all SVGs and also PNGs. Processes like 10x faster on SVGs than PNGs so strongly recommend to have Papirus for scalable icons.

3rd version bump in a day lets go.

Eventually it should look for other themes besides just Papirus, HiColor, and Adwaita but idk how to implement that without a whole lot of scanning.