SessionItem is used only in MaskItemObject in masks

GUI/Model/Data/IntensityDataItem.h

GUI/Model/Data/ProjectionItems.cpp

GUI/Model/Data/ProjectionItems.h

GUI/Model/Device/MaskItems.cpp

GUI/Model/Device/MaskItems.h

GUI/Model/Device/MaskUnitsConverter.cpp

GUI/Model/Device/MaskUnitsConverter.h

GUI/View/Mask/MaskGraphicsProxy.h

GUI/View/Mask/MaskGraphicsScene.cpp

GUI/View/Mask/MaskGraphicsScene.h

GUI/View/Mask/MaskViewFactory.cpp

GUI/View/Mask/MaskViewFactory.h

GUI/View/Projection/ProjectionsPlot.cpp

GUI/View/Projection/ProjectionsPlot.h

GUI/View/Projection/SaveProjectionsAssistant.cpp

GUI/View/Projection/SaveProjectionsAssistant.h