Grail42: test framework done enough for now

Now that the Grail42 C++ test framework has some basic documentation, it is time to move on to a new project.  The framework is by no means ‘done’ as I have numerous enhancements in mind for it and there is definitely some clean-up needed on the internal details.  That said, it is sufficiently done to allow easily creating C++ unit tests that are multi-threaded and multi-platform.  In turn I’m going to prioritize future enhancements based on the specific needs of other projects.