rely on automatic type conversion without QStringLiteral(...)

GUI/coregui/Models/ComboProperty.cpp

GUI/coregui/Models/DataItem.cpp

GUI/coregui/Models/FTDecayFunctionItems.cpp

GUI/coregui/Models/FTDistributionItems.cpp

GUI/coregui/Models/FitParameterHelper.cpp

GUI/coregui/Models/FitParameterItems.cpp

GUI/coregui/Models/FitParameterProxyModel.cpp

GUI/coregui/Models/FormFactorItems.cpp

GUI/coregui/Models/InstrumentItems.cpp

GUI/coregui/Models/InterferenceFunctionItems.cpp

GUI/coregui/Models/JobItem.cpp

GUI/coregui/Models/Lattice2DItems.cpp

GUI/coregui/Models/LayerItem.cpp

GUI/coregui/Models/LayerRoughnessItems.cpp

GUI/coregui/Models/MesoCrystalItem.cpp

GUI/coregui/Models/MinimizerItem.cpp

GUI/coregui/Models/MultiLayerItem.cpp

GUI/coregui/Models/ParticleCompositionItem.cpp

GUI/coregui/Models/ParticleCoreShellItem.cpp

GUI/coregui/Models/ParticleDistributionItem.cpp