private void unregisterServices() {
		for (ServiceInterfaceImplementationPair siip : services) {
			tool.removeService(siip.interfaceClass, siip.provider);
		}
	}
Returns the combination of required and non-required used services.

@return union of the lists of required and non-required used services.
Ghidra/Framework/Project/src/main/java/ghidra/framework/plugintool/Plugin.java