Refactor: raw pointers as return types of factory functions -> unique_ptr

GUI/coregui/Models/BeamAngleItems.cpp

GUI/coregui/Models/BeamAngleItems.h

GUI/coregui/Models/BeamDistributionItem.cpp

GUI/coregui/Models/BeamDistributionItem.h

GUI/coregui/Models/DistributionItem.cpp

GUI/coregui/Models/DistributionItem.h

GUI/coregui/Models/DomainObjectBuilder.cpp

GUI/coregui/Models/DomainObjectBuilder.h

GUI/coregui/Models/DomainSimulationBuilder.cpp

GUI/coregui/Models/FormFactorItems.cpp

GUI/coregui/Models/FormFactorItems.h

GUI/coregui/Models/TransformToDomain.cpp

GUI/coregui/Models/TransformToDomain.h

GUI/coregui/Views/InfoWidgets/DistributionWidget.cpp

GUI/coregui/Views/MaterialEditor/MaterialUtils.cpp

GUI/coregui/Views/MaterialEditor/MaterialUtils.h

GUI/coregui/utils/GUIHelpers.h

Tests/UnitTests/TestGUI/TestFormFactorItems.h

Tests/UnitTests/TestGUI/TestLayerRoughnessItems.h