Track: Don't record notes when timeline stopped

Merge branch 'master' of git+ssh://github.com/ideoforms/isobar

Track quantize

Add further MIDI logging

Merge branch 'master' of github.com:ideoforms/isobar

Track: Add quantize

Track: Add .clear(), .stop_all_notes()

Fix virtual device handling in tests

Track: Record notes using track time, not timeline time

Track: Add get_notes/delete_notes

Use proper all_notes_off message

Ensure Timeline is aware of all Track output devices

Fix syntax error

Metronome: Allow configurable midi_channel

Metronome: Allow configurable midi_channel