plugins/tracklength-gstreamer.c: Rewrite to use `GstDiscoverer'.

[disorder] / disobedience / disobedience.desktop

[Desktop Entry]
Type=Application
Name=Disobedience
Comment=User interface for DisOrder network jukebox
Exec=disobedience
Icon=disobedience.png
Terminal=false
Categories=Audio;AudioVideo;Player;Music;