Start drawing some very rudimentary notes.

I'm picking the correct (but hard-coded by glyph index) noteheads
out of the Gonville font. But I'm not drawing any stems nor flags
yet. Also the spacing between the notes isn't interesting yet, nor
do I have measure lines, nor ledger lines.

Oh, and the notes I added here for testing aren't even musically
interesting either. Anyway, we're still getting started obviously.