Use STL algorithms instead of raw for-loops.

GeoLib/Polygon.cpp

MathLib/LinAlg/Eigen/EigenVector.h

MathLib/LinAlg/Lis/LisMatrix.h

MeshGeoToolsLib/BoundaryElementsSearcher.cpp

MeshGeoToolsLib/MeshNodeSearcher.cpp

NumLib/DOF/ComputeSparsityPattern.cpp

NumLib/DOF/LocalToGlobalIndexMap.cpp

NumLib/DOF/MeshComponentMap.cpp

NumLib/Extrapolation/LocalLinearLeastSquaresExtrapolator.cpp

ProcessLib/HydroMechanics/HydroMechanicsFEM.h

ProcessLib/LIE/Common/LevelSetFunction.cpp

ProcessLib/LIE/Common/MeshUtils.cpp

ProcessLib/LIE/SmallDeformation/SmallDeformationProcess.cpp

ProcessLib/Output/IntegrationPointWriter.cpp

ProcessLib/Process.cpp

ProcessLib/ProcessVariable.cpp

ProcessLib/SmallDeformation/SmallDeformationFEM.h

...ib/SmallDeformationNonlocal/SmallDeformationNonlocalFEM.h

ProcessLib/TES/TESLocalAssembler-impl.h

ProcessLib/VectorMatrixAssembler.cpp