Update in common header of GUI source files

GUI/coregui/Models/ApplicationModels.cpp

GUI/coregui/Models/ApplicationModels.h

GUI/coregui/Models/AxesItems.cpp

GUI/coregui/Models/AxesItems.h

GUI/coregui/Models/BackgroundItems.cpp

GUI/coregui/Models/BackgroundItems.h

GUI/coregui/Models/BeamAngleItems.cpp

GUI/coregui/Models/BeamAngleItems.h

GUI/coregui/Models/BeamDistributionItem.cpp

GUI/coregui/Models/BeamDistributionItem.h

GUI/coregui/Models/BeamItem.cpp

GUI/coregui/Models/BeamItem.h

GUI/coregui/Models/BeamWavelengthItem.cpp

GUI/coregui/Models/BeamWavelengthItem.h

GUI/coregui/Models/ComboProperty.cpp

GUI/coregui/Models/ComboProperty.h

GUI/coregui/Models/ComponentProxyModel.cpp

GUI/coregui/Models/ComponentProxyModel.h

GUI/coregui/Models/ComponentProxyStrategy.cpp

GUI/coregui/Models/ComponentProxyStrategy.h