ENH: bootstrap for ML model factories

Code/UtilitiesAdapters/OpenCV/otbBoostMachineLearningModel.h

...UtilitiesAdapters/OpenCV/otbBoostMachineLearningModel.txx

...dapters/OpenCV/otbKNearestNeighborsMachineLearningModel.h

...pters/OpenCV/otbKNearestNeighborsMachineLearningModel.txx

.../OpenCV/otbKNearestNeighborsMachineLearningModelFactory.h

...penCV/otbKNearestNeighborsMachineLearningModelFactory.txx

Code/UtilitiesAdapters/OpenCV/otbMachineLearningModel.h

...UtilitiesAdapters/OpenCV/otbMachineLearningModelFactory.h

...ilitiesAdapters/OpenCV/otbMachineLearningModelFactory.txx

...iesAdapters/OpenCV/otbRandomForestsMachineLearningModel.h

...sAdapters/OpenCV/otbRandomForestsMachineLearningModel.txx

...ters/OpenCV/otbRandomForestsMachineLearningModelFactory.h

...rs/OpenCV/otbRandomForestsMachineLearningModelFactory.txx

Code/UtilitiesAdapters/OpenCV/otbSVMMachineLearningModel.h

Code/UtilitiesAdapters/OpenCV/otbSVMMachineLearningModel.txx