Various fixes and improvements

WatchRecordings: Add option to use either the mythprotocol or http streaming

WatchRecordings: ignore recordings in the LiveTV and Deleted recgroup. Note requires current MythTV master to work

WatchRecordings: add option to use either the MDK or QtAV players

VideosGridFolder: add option to use either the MDK or QtAV players.

IPTVViewer: Allow the decoder used to be changed. Press F5 to swap between VLC, QtAV or MDK players.

Fix a problem with the web browser sometimes not responding to mouse clicks

Make the behaviour of the various players more consistent

WebVideoViewer: show the full video description in the InfoDialog (Press I)

RadioPlayerDialog: save and restore last played theme music. Some themes allow you to choose from many music files or streams. MythQML will now remember which one you choose and play the same one the next time you start the frontend.