* adding interfaces for toggling fullscreen
* passing in destrect to omx
* adding flag for deffering video update
* remove skipUpdate option for video output
* fixing omx player stop deadlock; setting omx alpha in constructor
* jk not setting opacity in constructor for omx
* removing unsed function
On Qt5 OGL backend, the default draw layer for the UI is 1.
OMXplayer draws on layer 0, thus the interface never shows up.
This forces OMXplayer to draw on layer 2.