Unknown Quality in Profiles

This will let some anime that doesn't have a quality marker in the title be grabbed automatically. https://trello.com/c/rdxwJsLg/393-ability-to-add-unknown-quality-to-profile

Not a huge fan of the migration, but it doesn't need to be checked on every start either.

Also pulled some old code for re-ordering quality definitions.
Yeah, there is no reason to store the weight in the table at all, except maybe to simplify the service layer (currently it has a unique constraint that breaks the intended use anyways).