deserialize method
Deserializes the FML template elements, attributes and children
Implementation
@override
void deserialize(XmlElement xml) {
// deserialize
super.deserialize(xml);
// properties
icon = Xml.get(node: xml, tag: 'icon') ?? Xml.get(node: xml, tag: 'value');
size = Xml.get(node: xml, tag: 'size');
}