Enable reordering of flags

With a growing collection of Anki notes, I’ve come to appreciate the colored flags, each named after the maintenance task needed (revise, split, add image, format, update, add example sentence). It would be useful to be able to change (drag and drop) their order (sidebar in the note browser) afterwards, keeping the colors.

I think that would be confusing because each flag has a hard-coded number that is used in searching and for shortcuts.