Add Tile for Media

[lukiffer]

Add a tile for any media devices in the room. While there's not an extensive amount of relevant functionality, perhaps the ability to pause/resume playing media would be relevant. Volume control another possibility. But this would mostly be for the whole-room on/off switch to shutdown TVs and media players when the room is turned off. We should also consider whether we would want to turn on TVs, etc. when the room is turned on.