zmidi-basic

Copperbox revision 1962.

I've changed the syntax representation to use JoinLists for Tracks and Sections - this will allow them to be assembled with cheap append.

With the next commit I expect to change the project name from zmidi-basic to zmidi-construction. It is looking like the library will only cover building MIDI files so needs a better name. Originally I wanted to analyse MIDI files as well but this can go in another library when I get round to it.