TruncatedCube included in GUI, multiple correction in Core for TruncatedCube

Core/FormFactors/inc/FormFactorTruncatedCube.h

Core/FormFactors/src/FormFactorTruncatedCube.cpp

Core/Samples/inc/ISampleVisitor.h

Core/Samples/src/ISampleVisitor.cpp

Core/Tools/inc/PyGenVisitor.h

Core/Tools/inc/SampleMaterialVisitor.h

Core/Tools/inc/SamplePrintVisitor.h

Core/Tools/src/PyGenVisitor.cpp

Core/Tools/src/SampleMaterialVisitor.cpp

Core/Tools/src/SamplePrintVisitor.cpp

GUI/coregui/Models/FormFactorItems.cpp

GUI/coregui/Models/FormFactorItems.h

GUI/coregui/Models/GUIObjectBuilder.cpp

GUI/coregui/Models/GUIObjectBuilder.h

GUI/coregui/Models/GroupPropertyRegistry.cpp

GUI/coregui/Models/ItemFactory.cpp

GUI/coregui/Models/item_constants.h