libjpeg: added NO_GETENV define
highgui project: set CompileAsWinRT true, added CaptureMediaFrameGrabber files, removed cap_vfw.cpp for WinRT project
cap_winrt.cpp: added copyright notice, implemented cvCreateCameraCapture_WinRT() and GrabFrameAsync() copy to XAML image element, RUNS OK
added CaptureFrameGrabber files to highgui/src
removed CaptureFrameGrabber files from sample app and into highgui module
video.sln: added highgui and libpng etc projects
video sample app project: removed CaptureFrameGrabber files
MainPage.xaml.cpp and .h: moved CaptureFrameGrabber calls into highgui module
main.cpp: added copyright notice, added background thread using SL for opencv calls, added init() called from OnNavigate