Switch from builtin video sink to qmlglsink

qgroundcontrol.pro

src/FlightDisplay/FlightDisplayViewVideo.qml

src/FlightDisplay/VideoManager.cc

src/FlightDisplay/VideoManager.h

src/FlightMap/QGCVideoBackground.qml

src/QGCApplication.cc

src/VideoStreaming/VideoItem.cc

src/VideoStreaming/VideoItem.h

src/VideoStreaming/VideoReceiver.cc

src/VideoStreaming/VideoReceiver.h

src/VideoStreaming/VideoStreaming.cc

src/VideoStreaming/VideoStreaming.pri

src/VideoStreaming/VideoSurface.cc

src/VideoStreaming/VideoSurface.h

src/VideoStreaming/VideoSurface_p.h

src/VideoStreaming/gstqtvideosink/delegates/basedelegate.cpp

src/VideoStreaming/gstqtvideosink/delegates/basedelegate.h

...ng/gstqtvideosink/delegates/qtquick2videosinkdelegate.cpp

...ming/gstqtvideosink/delegates/qtquick2videosinkdelegate.h

...treaming/gstqtvideosink/delegates/qtvideosinkdelegate.cpp