Added visualization of point cloud data from Kinect camera. Colorized point cloud visualization to follow soon.

corrected a compile warning in Wayppoint.cc, made adaptions to Freenect for the current revision of the code (update libfreenect repository!), commented out pixhawk poi mavlink code - needs fixing

Changed status message in qgroundcontrol.pro, fixed compile error in class Freenect (void* did not work)

Ardupilot support, builds now cleanly on Windows. Fixed a bug where the application could crash if no system was connected.