Converting badge quality property from color to an integer representation for later sorting purposes

Summary: Ref T9007

Test Plan: Create badges, update quality, search by quality without change of functionality.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: Korvin

Maniphest Tasks: T9007

Differential Revision: https://secure.phabricator.com/D15551