ENH: Classification Map Regularization: only input image type is templated in the declaration of the filtertype in the tests, example and application

ENH: ClassificationMapRegularization Application: structuring element (ball) with the same radius along X and Y, the corresponding documentation, test and baselines were updated.

ENH: Classification Map Regularization by Majority Voting, new parameter names in accordance with itkLabelVotingImageFilter

ENH: Majority Voting: multiple majority labels are set either to UnDefinedValue or to their original value (by default)

BUG: Changing the random intialisation method since it can generate centroids that are too far from the image distribution and will never move