protected final List<Class<?>> getServicesRequired() {
		// return either the new PluginDescription servicesRequired or the old
		// deprecated legacyRequiredServices.
		return pluginDescription.getServicesRequired();
	}
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