Refactoring the matrix reader, implementing the matrix writer.

src/implementation/matrices/CMakeLists.txt

src/implementation/matrices/tnlMatrixReader_impl.h

src/implementation/matrices/tnlMatrixWriter_impl.h

src/implementation/matrices/tnlMatrix_impl.h

src/legacy/matrices/tnlMatrix.cpp

src/legacy/matrices/tnlMatrix.h

src/matrices/CMakeLists.txt

src/matrices/tnlMatrix.h

src/matrices/tnlMatrixReader.h

src/matrices/tnlMatrixWriter.h

tests/benchmarks/CMakeLists.txt

tests/long-time-unit-tests/matrix-formats-test.h

tests/long-time-unit-tests/tnl-run-matrix-formats-test

tests/unit-tests/tnl-unit-tests.h

tools/src/CMakeLists.txt