pack DiffuseElement in uniq_ptr

Base/Element/DiffuseElement.cpp

Base/Element/IElement.h

Base/Element/PolarizerPair.cpp

Base/Element/PolarizerPair.h

Core/Computation/DWBAComputation.cpp

Core/Computation/DWBAComputation.h

Core/Computation/DepthProbeComputation.cpp

Core/Contrib/GISASSpecularContribution.cpp

Core/Contrib/RoughMultiLayerContribution.cpp

Core/Element/SpecularElement.cpp

Core/Fitting/SimDataPair.cpp

Core/Scan/AngularSpecScan.cpp

Core/Scan/AngularSpecScan.h

Core/Scan/ISpecularScan.h

Core/Scan/QSpecScan.h

Core/Simulation/DepthProbeSimulation.cpp

Core/Simulation/GISASSimulation.cpp

Core/Simulation/ISimulation2D.cpp

Core/Simulation/ISimulation2D.h

Core/Simulation/OffSpecularSimulation.cpp