protected void close() {
		// do nothing by default; subclasses should override as needed
	}
Close the plugin.   This is when the plugin should release resources, such as those from
other services.  This method should not close resources being used by others (that should
happen in dispose()).

<p>This method will be called before {@link #dispose()}.
Ghidra/Framework/Project/src/main/java/ghidra/framework/plugintool/Plugin.java