@Override
	public String getSerializationString() {
		String outputId = toExternalId(id);
		return outputId + " = " + getValueOutput();
	}
Constructor used when the IconValue will inherit its {@link Icon} from another IconValue. The
icon value field will be null.
@param id the id for this IconValue
@param refId the id of another IconValue that this IconValue will inherit from
Ghidra/Framework/Gui/src/main/java/generic/theme/IconValue.java