Refactoring the fast sweeping method.

examples/hamilton-jacobi/tnl-direct-eikonal-solver.h

examples/hamilton-jacobi/tnlDirectEikonalMethodsBase.h

examples/hamilton-jacobi/tnlDirectEikonalMethodsBase_impl.h

examples/hamilton-jacobi/tnlDirectEikonalProblem.h

examples/hamilton-jacobi/tnlDirectEikonalProblem_impl.h

examples/hamilton-jacobi/tnlFastSweepingMethod.h

examples/hamilton-jacobi/tnlFastSweepingMethod1D_impl.h

examples/hamilton-jacobi/tnlFastSweepingMethod2D_impl.h

examples/hamilton-jacobi/tnlFastSweepingMethod3D_impl.h

src/core/tnlTypeInfo.h

src/functions/tnlFunctions.h

src/functions/tnlMeshFunction_impl.h

src/functions/tnlParaboloid.h

src/functions/tnlParaboloidSDF.h

src/functions/tnlParaboloidSDF_impl.h

src/functions/tnlParaboloid_impl.h

src/functions/tnlTestFunction_impl.h