Add Tracks Support

- Use new JSON file, and parse tracks data
- Add a new tracks chooser interface
- Add tracks to created media
- Process tracks data from MediaStatus
- Add settings bundle for caption options
- Remove old feature flags

Change-Id: I62540c2c993d97d194ec0df735bfd0aa2701b5e7
Resolve issues with Tracks support

- Remove settings for captions in preference of using system prefs via createDefault.
- Fix connection status reporting when app was disconnected.
- Fix reconnecting after background app.
- Remove unused test target

Change-Id: Iaef63d07b25df2ab09f49d946bd21558042b3021