Integrate NiTE2 for gesture recognition

Integrate NiTE2 to add a hand tracker to perform gesture recognition (waving and clicking)
Add headers and binaries of OpenNI 2.2.0.33 and NiTE 2.2.0.10
Add ~<camera>/gestures topic where pal_vision_msgs/Gesture is published everytime a hand-based gesture is recognized
Fix few cppcheck errors