[NL] Remove vector<unique_ptr> from DOF table. (#1790)

NumLib/DOF/LocalToGlobalIndexMap.cpp

NumLib/DOF/LocalToGlobalIndexMap.h

NumLib/DOF/MeshComponentMap.cpp

NumLib/DOF/MeshComponentMap.h

.../BoundaryCondition/GenericNaturalBoundaryCondition-impl.h

ProcessLib/CalculateSurfaceFlux/CalculateSurfaceFlux.cpp

ProcessLib/HydroMechanics/HydroMechanicsProcess.h

.../BoundaryCondition/GenericNaturalBoundaryCondition-impl.h

ProcessLib/LIE/HydroMechanics/HydroMechanicsProcess.cpp

ProcessLib/LIE/SmallDeformation/SmallDeformationProcess.cpp

ProcessLib/Process.cpp

ProcessLib/SmallDeformation/SmallDeformationProcess.h

Tests/NumLib/LocalToGlobalIndexMap.cpp

Tests/NumLib/LocalToGlobalIndexMapMultiComponent.cpp

Tests/NumLib/TestComponentNorms.cpp

Tests/NumLib/TestExtrapolation.cpp

Tests/NumLib/TestMeshComponentMap.cpp

Tests/NumLib/TestSerialLinearSolver.cpp

Tests/NumLib/TestSparsityPattern.cpp