Adds support for customizing the items listed on the left side
navigation drawer menu. Each item can be toggled on/off in settings.
The hidden ones are still accessible under "More" on the nav drawer,
which only appears if some items are hidden.
Additionally, if any of menu items are hidden, their "latest" content
will not appear on the home page.
The setting is stored per user profile.
Remembers changes in playback tracks across playbacks. So, if you change
the audio track, quit the app, and return to the same id, the app will
play the audio track previously chosen.
Additionally, this PR fixes a UI inconsistency when there are multiple
versions of a item. Previously sometimes the audio/subtitle tracks for
wrong version would be shown during playback.
