ENH: move otbHoover to Code/Segmentation

Code/Segmentation/otbHooverInstanceFilter.h

Code/Segmentation/otbHooverInstanceFilter.txx

Code/Segmentation/otbHooverMatrixFilter.h

Code/Segmentation/otbHooverMatrixFilter.txx

Testing/Code/OBIA/CMakeLists.txt

Testing/Code/OBIA/otbOBIATests1.cxx

Testing/Code/Segmentation/CMakeLists.txt

Testing/Code/Segmentation/otbHooverInstanceFilterNew.cxx

.../Segmentation/otbHooverInstanceFilterToAttributeImage.cxx

Testing/Code/Segmentation/otbHooverMatrixFilter.cxx

Testing/Code/Segmentation/otbHooverMatrixFilterNew.cxx

Testing/Code/Segmentation/otbSegmentationTests1.cxx