Play state should be tracked and preserved

Related to #668 (closed)

If I am playing an audio album, for example, then I quit the app mid album, when I re-open the app, the player should resume where I left off by default.

Likewise, if I am shuffling all songs in my library, then I quit the app, when I re-open the app, the player should resume where I left off by default, and should remain in the "shuffle" state.

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