to ``mk_genfile_common.py`` and adapt ``mk_util.py`` and
``mk_gparams_register_modules_cpp.py`` to use the code at its new
location. The interface has been changed slightly so that
``mk_gparams_register_modules_internal()`` now returns the path
to the generated file. The motivation behind this so that clients
of the function know the path to the generated file.
Whilst I'm here reindent ``mk_gparams_register_modules_cpp.py``
and the relevant code in ``mk_util.py``.
Also remove duplicated code that is now available in
``mk_genfile_common.py``.
The purpose of this change is to have Python code common to the Python
and CMake build systems separate from Python code that is only used for
the Python build system.
function ``mk_gparams_register_modules_internal()`` which is called by a
new ``mk_gparams_register_modules_cpp.py`` script. This will allow other build systems to
generate the ``gparams_register_modules.cpp`` files.
