Cleanup in ISampleVisitor, new global function VisitSampleTree

App/src/TestMiscellaneous.cpp

Core/PythonAPI/src/FormFactorSphere.pypp.cpp

Core/PythonAPI/src/FormFactorSphereGaussianRadius.pypp.cpp

Core/PythonAPI/src/IFormFactor.pypp.cpp

Core/PythonAPI/src/IFormFactorBorn.pypp.cpp

Core/PythonAPI/src/IFormFactorDecorator.pypp.cpp

Core/PythonAPI/src/IInterferenceFunction.pypp.cpp

Core/PythonAPI/src/ISample.pypp.cpp

.../PythonAPI/src/InterferenceFunction1DParaCrystal.pypp.cpp

Core/PythonAPI/src/InterferenceFunction2DLattice.pypp.cpp

.../PythonAPI/src/InterferenceFunction2DParaCrystal.pypp.cpp

Core/PythonAPI/src/InterferenceFunctionNone.pypp.cpp

Core/PythonAPI/src/LayerRoughness.pypp.cpp

Core/Samples/inc/ISample.h

Core/Samples/inc/ISampleHierarchicalVisitor.h

Core/Samples/inc/ISampleVisitor.h

Core/Samples/src/ISample.cpp

Core/Samples/src/ISampleHierarchicalVisitor.cpp

Core/Samples/src/ISampleVisitor.cpp

Core/Tools/inc/SampleMaterialVisitor.h