public void releaseDomainFiles(Object consumer) {
		List<DomainObjectAdapter> matchingObjs = new ArrayList<>();
		synchronized (this) {
			for (DomainObjectAdapter domainObj : openDomainObjects.values()) {
				if (domainObj.getConsumerList().contains(consumer)) {
					matchingObjs.add(domainObj);
				}
			}
		}

		// release consumers outside of synch block
		for (DomainObjectAdapter domainObj : matchingObjs) {
			try {
				domainObj.release(consumer);
			}
			catch (IllegalArgumentException e) {
				// ignore
			}
		}
	}
Returns the owner of the project that is associated with this 
DefaultProjectData.  A value of null indicates an old multiuser
project.
@return the owner of the project
Ghidra/Framework/Project/src/main/java/ghidra/framework/data/DefaultProjectData.java