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');
expandedicon = Xml.get(node: xml, tag: 'expandedicon');
// Build Nodes and find the youngestGeneration
_buildNodes();
// build prototype
_buildPrototype();
}