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There's a strange bug when removing courses with a custom colour, where the course to the left takes on the colour. Only the underlying input changes - not the bootstrap form control, so maybe React rendering at play?

Also, a user can't reset an overridden colour. We could use sessionStorage, but the UX wouldn't be clear. Resetting on removal of a course would work, but Typeahead returns all selected (not the changes) so we'd have to find the removed course. This might be useful for later state changes down the track though, so it's my preferred option.

Uh... bump? According to @pl4nty, this PR will be superseded by a complete rewrite of this project, but will remain a draft as it contains useful code.