replace 'MaskEditorFlags' by 'MaskFlags'

GUI/View/Canvas/MaskEditorActions.cpp

GUI/View/Canvas/MaskEditorActions.h

GUI/View/Canvas/MaskEditorCanvas.h

GUI/View/Canvas/MaskToolbox.cpp

GUI/View/Canvas/MaskToolbox.h

GUI/View/Canvas/ProjectionsEditorCanvas.cpp

GUI/View/Canvas/ProjectionsEditorCanvas.h

GUI/View/Canvas/ProjectionsWidget.cpp

GUI/View/Canvas/ProjectionsWidget.h

GUI/View/Frame/Plot2DWithProjectionFrame.cpp

GUI/View/Scene/MaskFlags.h

GUI/View/Scene/MaskGraphicsScene.cpp

GUI/View/Scene/MaskGraphicsScene.h

GUI/View/Scene/MaskGraphicsView.cpp

GUI/View/Scene/MaskGraphicsView.h

GUI/View/Setup/ProjectionsToolpanel.cpp

GUI/View/Setup/ProjectionsToolpanel.h