Rename enums, functions parameters and class member variables so that
they match the Circle coding style more closely.
Replace /* ... */ comments with // comments.
Fixup some indentation issues/trailing whitespace.
Remove undefined functions and unused #defines.
This is a significant rewrite of the MIDI stream parsing code. USB and
serial MIDI streams now both use a common parsing class that maintains
its own state and dispatches valid MIDI events as they arrive.
Some more major fixes for devices that send using Running Status like
the UM-ONE MkII have also been made, and support for all valid MIDI 1.0
messages has been added, even though mt32emu may not use all of them.
Fixes#25 and fixes#26.
