Fixed to use only one HandTracker (it will track all hands).
Moved HandTracker initialization to VirtualScreenManager (it will take
care of focuse gesture detection and hand point tracking).
VirtualScreenManager tested and working.
Simple Main implemented. Need to find out how to display camera image in
AWT component.
Implemented visualization of RGB video stream.
Click gesture implemented and tested.
GestureManager tested.
Removed listener callback from gesture and moved to GestureManager.