[serialization_5] GUI: serialization refactoring part 5 ()

GUI/Model/Data/RealItem.cpp

GUI/Model/Data/RealItem.h

GUI/Model/Device/AxesItems.cpp

GUI/Model/Device/AxesItems.h

GUI/Model/Device/PointwiseAxisItem.cpp

GUI/Model/Device/PointwiseAxisItem.h

GUI/Model/Device/SpecularBeamInclinationItem.cpp

GUI/Model/Device/SpecularBeamInclinationItem.h

GUI/Model/Job/FitParameterContainerItem.cpp

GUI/Model/Job/FitParameterContainerItem.h

GUI/Model/Job/FitParameterItem.cpp

GUI/Model/Job/FitParameterItem.h

GUI/Model/Job/FitParameterLinkItem.cpp

GUI/Model/Job/FitParameterLinkItem.h

GUI/Model/Job/FitSuiteItem.cpp

GUI/Model/Job/FitSuiteItem.h

GUI/Model/Job/JobItem.cpp

GUI/Model/Job/JobItem.h

GUI/Model/Job/MinimizerItem.cpp

GUI/Model/Job/MinimizerItem.h