Added CWYGMRES solver (GMRES using Hauseholder orthogonalization and the compact CWY representation)

Conflicts:
	src/TNL/CMakeLists.txt
	src/TNL/Devices/Cuda.cpp
	src/TNL/Meshes/GridDetails/GridTraverser_impl.h
	src/TNL/Problems/HeatEquationProblem.h
	src/TNL/Solvers/ODE/ExplicitSolver.h
	src/TNL/TimerCPU.h
	src/TNL/TimerRT.h

The original method for detecting changes to the wrapped objects (using
the 'modified' bool flag) is used to avoid unnecessary calls to
std::memcmp.

All dynamically allocated objects in the smart pointers were aggregated
into a single structure to avoid the number of dynamic allocations,
decrease the size of the smart pointer classes and to make the code more
readable.

This reverts commit 40379dcf.

This will indicate to the user that the data will not be modified in the
solver. I think that it's not necessary to differentiate between e.g.
MatrixPointer and MatrixConstPointer, because these are implicitly
mutually assignable.

This might happen e.g. if lazy is true and synchronize() is called before the
objects are created,