LP-109 video gadget

LP-109 add gstreamer library and video gadget

LP-109 fix long video pauses with rtsp protocol over wifi

workaround https://bugreports.qt.io/browse/QTBUG-40332

LP-109 video gadget: add gstreamer to About credits

LP-109 about credits: fix URLs of Qt and msys2

LP-109 cleanup copydata.pro files

to bring them up to par with gstreamer's copydata.pro file

LP-109 video gadget: add Mac support

credits go to Ben Meng for making the video gadget work on Mac

LP-109 video gadget: add Linux support

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