Node - #activity#restart

• For Xmind ChatTree, the first line of the node content must be "#activity#restart", and then there is no need for other lines of content, such as:

  #activity#restart

• For Python ChatTree, the first parameter of chattree.create_node() must be "#activity#restart", and the second parameter dict is empty, such as:

  xxx_node = chattree.create_node("#activity#restart", {})

• Restart the entire dialogue immediately