Configurable Quality Definitions

Preliminary version for comments.
Replaces QualitySize with QualityDefinition allowing the user to change the order (weight) and SceneName (eg. '720p WEB-DL' instead of 'WEBDL-720p').
Replaces most JSON Quality in the database with id.
The UI is only a mock, no reordering is implemented yet. QualitySize should be a range-slider once implemented.
Some Tests are tbd.