2.20.1
* Fix problems with the volume and fullscreen popups staying up
* Avoid the seekbar getting stuck when seeking fails
* Support http://www.play.cz/radio-7

* GStreamer backend:
  - Allow taking screenshots of visualisations

* Browser plugin:
  - Fix replaying the stream when we got a redirection, such
    as on the Apple trailers pages
  - Fix crasher when playing audio-only streams