private void codeAddedRemoved(ProgramChangeRecord rec) {
		if (rec.getNewValue() instanceof Data) {
			domainObjectWorker.schedule(new CodeAddedRemoveJob(currentProgram, rec.getStart()));
		}
	}
Tells a plugin that it is no longer needed.
The plugin should remove itself from anything that
it is registered to and release any resources.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/symtable/SymbolTablePlugin.java