public void addField(FieldFactory ff) {
		fields.add(ff);
		layoutFields();
	}
Notifies that the field options have changed.
@param options the Options object that changed.
@param optionName the name of the property that changed.
@param oldValue the old value of the property.
@param newValue the new value of the property.
Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/format/FieldFormatModel.java