ENH: rename ImageViewerManager into Viewer

Code/Visualization/CMakeLists.txt

Code/Visualization/Viewer/CMakeLists.txt

Code/Visualization/Viewer/Controller/otbViewerController.cxx

Code/Visualization/Viewer/Controller/otbViewerController.h

...lization/Viewer/Controller/otbViewerControllerInterface.h

Code/Visualization/Viewer/Model/otbViewerModel.cxx

Code/Visualization/Viewer/Model/otbViewerModel.h

Code/Visualization/Viewer/View/otbAutoScaleActionHandler.h

Code/Visualization/Viewer/View/otbViewerViewGUI.cxx

Code/Visualization/Viewer/View/otbViewerViewGUI.h

Code/Visualization/Viewer/View/otbViewerViewGroup.fl

Code/Visualization/Viewer/otbViewer.cxx