Page Up and Page Down now available

Program now controls presentation slides with hand gestures.
Improved Code Robustness and Efficiency

All scan variables are now directly stored in class member variables
rather than in temp variables then member variables. Release build and
_DEBUG macro now working properly. Sounds are re-enabled. All posible
variables are now tracked and stored. Kinect connection check now exits
application rather than just moves forward (if debug is enabled it will
show an error).