Remove #include "filesystem.h".

Applications/ApplicationsLib/TestDefinition.cpp

Applications/CLI/ogs.cpp

Applications/FileIO/Legacy/createSurface.cpp

Applications/InSituLib/Adaptor.cpp

BaseLib/ConfigTreeUtil.cpp

BaseLib/FileTools.cpp

Tests/FileIO/TestBoostGmlInterface.cpp

Tests/FileIO/TestCsvReader.cpp

Tests/FileIO/TestCsvWriter.cpp

Tests/FileIO/TestTetGenInterface.cpp

Tests/FileIO_Qt/TestQtGmlInterface.cpp

Tests/GeoLib/IO/TestGLIReader.cpp

Tests/MeshLib/TestVtkMappedMeshSource.cpp

scripts/cmake/Find.cmake