Implementing the mesh initializer.

src/core/tnlIndexedSet.h

src/implementation/core/arrays/tnlStaticArray_impl.h

src/implementation/core/tnlIndexedSet_impl.h

src/implementation/solvers/ode/tnlMersonSolver_impl.h

src/mesh/CMakeLists.txt

src/mesh/layers/tnlMeshStorageLayer.h

src/mesh/layers/tnlMeshSubentityStorageLayer.h

src/mesh/layers/tnlMeshSuperentityStorageLayer.h

src/mesh/tnlMeshEntity.h

src/mesh/tnlMeshEntityInitializer.h

src/mesh/tnlMeshInitializer.h

src/mesh/traits/tnlMeshSuperentitiesTraits.h

tests/unit-tests/core/arrays/tnlStaticArrayTester.h

tests/unit-tests/mesh/tnlMeshTest.cpp