[Merge] lp:~thomas-voss/media-hub/use-mpris-player-skeleton-and-register-with-indicator into lp:media-hub

[Nick Dedekind]

Review: Approve

LGTM.
Player appears in sound indicator and responds to feedback.

TODO - previous/next/album-art
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https://code.launchpad.net/~thomas-voss/media-hub/use-mpris-player-skeleton-and-register-with-indicator/+merge/232178
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