@Override
	public void addCancelledListener(CancelledListener mcl) {
		throw new UnsupportedOperationException();
	}
Implementation of a TaskMontor that can be "attached" to a GProgressBar.

The GTaskMonitor is a non-gui object for tracking the progress of a GTaskGroup or GTask.  It
is created by the GTaskManager as tasks are scheduled.  GUIs that wish to display the progress
of the groups and tasks can set a GProgressBar into a GTaskMonitor and it will display the
progress.
Ghidra/Framework/Project/src/main/java/ghidra/framework/task/GTaskMonitor.java