QT5.2 Remove VLC Dependency

.. if you are building with QT5.2.1 or higher we are no
   longer going to use VLC for video playback.

.. the QT Multimedia module seems to finally have made
   the grade and works as advertised on Linux and Windows

.. FOR NOW we will continue to use QTKit on Mac but that
   may also change soon.

This is to enable overlays -- placing the video behind the
charts etc.