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.
Guess it's a leftover from QualityProfile v0.1 when I wanted to allow the user to reorder the qualities globally, before we actually did it per QualityProfile in v0.4.