Rewritten to newest channel framework

NOTE:
Dependent on https://github.com/plexinc-plugins/Services.bundle/issues/588

* Now uses newest framework
* Live streaming removed since dependent on webkit(BBC now uses HDS instead of RTMP for live streams)
* Preference for SD video removed. Resolution choice is handled in Service plugin(returns 3 different choices for each clip)
* Radio channels removed. Could only get these to work on PMC/PHT, other clients doesn't seem to like audio-only streams. Maybe a new radio plugin(/audio) if there is enough interest?
* Verified/tested on PMS 0.9.7.22 OS X and PMC, Plex iOS, PlexConnect(when I temporary removed the RealRTMP flag in info.plist), Plex/Web