Internal cleanup

In this release the code was reorganised to be easier to understand, and many tests were added.

These tests validated the reorganisation and refactoring, and are also becoming useful as documentation.

The static data was moved out into bindingsData.py, and there was much rejoicing.

The code is now gathered into "Parser", "Output", and "Utility" sections. Still thinking about whether to make classes out of these responsibilities.

There was a war upon bad names, for example:

    for key, item in items.items(): # <-- useless!

to:

    for physicalKeySpec, physicalKey in physicalKeys.items():

This was a major clarification and made everything much easier to understand.