New function that calculates the 2d projection of the object attached to the label
New intern label placement, based on the works of S.Maas and J.Dollner in Seamless Integration of Labels into Interactive Virtual 3D Environements Using Parameterized Hulls.
optimized the algorithm for internal labels, and added some commentaries
implemented Evaluator method to calculate the average percentage of labels out of camera sight
merging to get the method to calculate average distance label-building