moves and experimental moves

GUI/Model/BaseItem/SessionItem.cpp

GUI/Model/BaseItem/SessionItem.h

GUI/Model/Item/AxesItems.h

GUI/Model/Item/BackgroundItems.h

GUI/Model/Item/BeamItems.h

GUI/Model/Item/Data1DViewItem.h

GUI/Model/Item/DataItem.h

GUI/Model/Item/DetectorItems.h

GUI/Model/Item/FitParameterContainerItem.h

GUI/Model/Item/FitParameterItem.h

GUI/Model/Item/FitParameterLinkItem.h

GUI/Model/Item/FitSuiteItem.h

GUI/Model/Item/FootprintItems.h

GUI/Model/Item/GroupItem.h

GUI/Model/Item/GroupItemController.cpp

GUI/Model/Item/InterferenceItems.cpp

GUI/Model/Item/ItemFactory.cpp

GUI/Model/Item/ItemWithParticles.cpp

GUI/Model/Item/JobItem.cpp

GUI/Model/Item/JobItem.h