@Override
			public void domainObjectClosed(DomainObject dobj) {
				// assert dobj == domainObj
				GTaskManagerFactory.domainObjectClosed(domainObject);
				GTaskManager.this.domainObject = null;
			}
Creates a new GTaskManager for an DomainObject
@param domainObject the domainObject that tasks scheduled in this GTaskManager will
operate upon.
@param threadPool the GThreadPool that will provide the threads that will be used to run 
tasks in this GTaskManager.
Ghidra/Framework/Project/src/main/java/ghidra/framework/task/GTaskManager.java