It now supports arbitrary regions! The tool itself still makes
rectangles, but you can shift-drag to add to the selection.
It also distinguishes visually between a floating selection and not, is
more easily visible against certain tile backgrounds and at small zoom
levels, and, I don't know, probably some other stuff.
Teal Knight suggestion. It's a purely backwards compatible way to distinguish the two characters a little more, and fits her theme, but it's up to you.
