Get all nodes

func get_all_nodes(root: Node,Filter : bool = false,NodeClass = Node,list = []):
    var _Class
    if NodeClass:
        _Class = NodeClass.new()
    if not Filter:
        for node in root.get_children():
            list.append(node)
            get_all_nodes(node,false,null,list)
        return list
    else:
        for node in root.get_children():
            if node.get_class() == _Class.get_class():
                list.append(node)
            get_all_nodes(node,true,NodeClass,list)
        return list