[j.823b] further minor cleanup in GUI Mask context ()

GUI/View/Mask/AllMasksDisplay.h

GUI/View/Mask/MaskEditorCanvas.cpp

GUI/View/Mask/MaskGraphicsProxy.h

GUI/View/Mask/MaskGraphicsScene.cpp

GUI/View/Mask/MaskGraphicsScene.h

GUI/View/Mask/MaskGraphicsView.cpp

GUI/View/Mask/MaskGraphicsView.h

GUI/View/Mask/RegionOfInterestDisplay.cpp

GUI/View/Mask/RegionOfInterestDisplay.h

GUI/View/Projection/ProjectionsEditorCanvas.cpp

GUI/View/Shape/EllipseDisplay.h

GUI/View/Shape/IMaskElementDisplay.cpp

GUI/View/Shape/IMaskElementDisplay.h

GUI/View/Shape/LineViews.cpp

GUI/View/Shape/LineViews.h

GUI/View/Shape/MaskContainerDisplay.h

GUI/View/Shape/MaskType.h

GUI/View/Shape/MaskUtil.cpp

GUI/View/Shape/MaskUtil.h

GUI/View/Shape/PolygonDisplay.cpp