@Override
	public int hashCode() {
		return Objects.hash(id, referenceId, value);
	}
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