Added code to visualize skeleton in 3D does not work yet.
Optimized code in skeletonizacion to not use so many memory
Deleted comments
Added Skeletonization3D class and renamed Skeletonization class
to Skeletonization2D. More encapsulation.
IMPORTANT -> In this commit RGBD camera is modified to read less frames to
speed up development
Added code to project 2D skeleton points to 3D.