@Override
	public String toString() {
		String name = getClass().getSimpleName();
		if (referenceId == null) {
			return name + " (" + id + ", " + value + ")";
		}
		return name + " (" + id + ", " + referenceId + ")";
	}
Returns the ThemeValue referred to by this ThemeValue. Needs to be overridden by
concrete classes as they know the correct method to call on the preferredValues map.
@param preferredValues the {@link GThemeValueMap} to be used to resolve the reference id
@param refId  the id of the reference ThemeValue
@return the ThemeValue referred to by this ThemeValue.
Ghidra/Framework/Gui/src/main/java/generic/theme/ThemeValue.java