Add UserAvatar fallback color and abbreviation on profile #5411
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If the user has a special symbol or color in a course or in some other organization, we still allow this to be overridden on a per camp basis. But a user should have the option to change the default (fallback) avatar. With this PR we add a color & abbreviation field to the profile. Also I forgot to add tests in the last PR #5281, with this PR these functionalities are also tested.