Revert "InkClocks now hosts multiple listeners; InkClockInternalThread has a new setDelay method; InkClockInternalThreadObject, a new JS object, represents the internal sequencer as 'seq' in user scripts, allowing the user to control sequencer tempo; the output flavor of MidiIoObject now accepts a tickLength parameter which schedules a NOTE_OFF MIDI message to be sent after a certain number of sequencer ticks"

This reverts commit b66f41473f8a470c2608265bd477100fe8508fa1.