more unit test for model mapper in items

GUI/coregui/Models/BeamDistributionItem.cpp

GUI/coregui/Models/BeamDistributionItem.h

GUI/coregui/Models/DetectorItems.cpp

GUI/coregui/Models/DetectorItems.h

GUI/coregui/Models/GroupProperty.cpp

GUI/coregui/Models/InterferenceFunctionItems.cpp

GUI/coregui/Models/ParameterizedItem.cpp

GUI/coregui/Models/ParameterizedItem.h

GUI/coregui/Models/ParticleCompositionItem.cpp

GUI/coregui/Models/ParticleItem.cpp

GUI/coregui/Models/ParticleItem.h

Tests/UnitTests/TestGUI/TestMapper.h