@Override
	public boolean hasValue(Settings setting) {
		return setting.getValue(settingName) != null;
	}
returns the Enum's ordinal using the Enum's string representation.

@param stringValue Enum's string rep
@return integer index of the Enum
Ghidra/Framework/Docking/src/main/java/ghidra/docking/settings/JavaEnumSettingsDefinition.java