v3.3.0

• Reimplemented preferences UI to show available preferences which can be set
  • Add additional unit tests to verify the proper functioning of this behavior and its implementation
• Froze project requirements to ensure that dependency updates don't break the project
• Refactored unit tests
  • Switched to using temporary preferences file for unit tests to avoid tampering with user preferences file
  • Switched to using patchers for mocking relevant modules
• Removed several vestigial helper functions