@Override
	public Icon get(GThemeValueMap values) {
		Icon icon = super.get(values);
		if (modifier != null) {
			return modifier.modify(icon, values);
		}
		return icon;
	}
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