Android TV support

One major device I spent time on that's currently not tracked is my TV which is connected to a Mi Box. As far as I know, there are no time-tracking apps for Android TV, which is a real shame since I sometimes spend a decent amount of time by the TV in the evenings (I've even noticed that I'm avoiding the TV since it doesn't get tracked...).

Found [this on SO](https://stackoverflow.com/questions/50981739/android-tv-getting-last-used-apps-through-usagestatsmanager) which seems to indicate UsageStatsManager isn't available on Android TV. After thinking about it that kind of makes sense, as there's likely a lot of active screentime that isn't actually active time, or *usage* (let's say I let it sit on the home screen, or Spotify being playing/paused for a long time).

Still, I would like some type of tracking of it, just not sure how. Until then I'll have to track the play history in the apps themselves (aw-watcher-spotify, LastFM, YouTube history, Plex + Trakt).