The old behaviour is available via waitKeyEx() call or
via setting of OPENCV_LEGACY_WAITKEY environment variable

checks whether the window exists and is visible. On QT closing a window
merley hides it, so the common hack for checking whether a window exists

exists = cv2.getWindowProperty(.., 0) >= 0

does not work.

also correctly forward spacing parameter in fontQt

Signed-off-by: Maxim Kostin <v-maxkos@microsoft.com>

   (use "git reset HEAD <file>..." to unstage)

	modified:   highgui/include/opencv2/highgui/highgui_c.h
	modified:   highgui/src/cap_dshow.cpp
	modified:   java/generator/gen_java.py

The correction of the orthographic error in the enumeration constant
CAP_PROP_MONOCROME has been undone.

   (use "git reset HEAD <file>..." to unstage)

	modified:   modules/highgui/include/opencv2/highgui/highgui_c.h
	modified:   modules/highgui/src/cap_dshow.cpp
	modified:   modules/highgui/src/cap_pvapi.cpp
	modified:   modules/java/generator/gen_java.py

Änderungen in der PvAPI hinzugefügt.

highgui: Support to change trackbar count in setTrackbarPos and replaced deprecated CreateToolbarEx in Windows.

highgui: Support to change trackbar count in setTrackbarPos and replaced deprecated CreateToolbarEx in Windows.

- disabled doxygen tree
- enabled doxygen enum listing
- added imgproc reference to main page
- enabled BiB support
- chenged doxygen root page format

Add depends from highgui to imgcodecs and videoio. And include header from imgcodecs and videoio to imgcodecs