ENH: remove Legacy dir which should never have got there

...werManager/Controller/otbImageViewerManagerController.cxx

...iewerManager/Controller/otbImageViewerManagerController.h

...ger/Controller/otbImageViewerManagerControllerInterface.h

Legacy/ViewerManager/Model/otbImageViewerManagerModel.cxx

Legacy/ViewerManager/Model/otbImageViewerManagerModel.h

Legacy/ViewerManager/View/otbAutoScaleActionHandler.h

Legacy/ViewerManager/View/otbImageViewerManagerViewGUI.cxx

Legacy/ViewerManager/View/otbImageViewerManagerViewGUI.h

Legacy/ViewerManager/View/otbImageViewerManagerViewGroup.fl

Legacy/ViewerManager/otbImageViewerManager.cxx