split directory GUI/Model/Item

GUI/Model/Device/AxesItems.cpp

GUI/Model/Device/AxesItems.h

GUI/Model/Device/BackgroundItems.cpp

GUI/Model/Device/BackgroundItems.h

GUI/Model/Device/BeamAngleItems.cpp

GUI/Model/Device/BeamAngleItems.h

GUI/Model/Device/BeamDistributionItem.cpp

GUI/Model/Device/BeamDistributionItem.h

GUI/Model/Device/BeamItems.cpp

GUI/Model/Device/BeamItems.h

GUI/Model/Device/BeamWavelengthItem.cpp

GUI/Model/Device/BeamWavelengthItem.h

GUI/Model/Device/DetectorItems.cpp

GUI/Model/Device/DetectorItems.h

GUI/Model/Device/FootprintItems.cpp

GUI/Model/Device/FootprintItems.h

GUI/Model/Device/InstrumentItems.cpp

GUI/Model/Device/InstrumentItems.h

GUI/Model/Device/MaskItems.cpp

GUI/Model/Device/MaskItems.h