Add support for mobile playback controls (Media Session API) #14
Description
Add support for controlling music playback from the notification panel without opening the webpage.
As of now, when playing something with jukebox this is how it looks (on Android):
With Media Session API, it is possible to expose controls for prev/next track and also information such as song name, artist, cover art.
https://developer.mozilla.org/en-US/docs/Web/API/Media_Session_API