Attachable handler for extending the VL kit with additional commands.
By default this just dies with an error message that says the command is unknown. But it is attachable, so advanced users can extend the toolkit with their own commands.
Definition:
(encapsulate (((vl-toolkit-other-command * * state) => state :formals (command args state) :guard (and (stringp command) (string-listp args) (state-p1 state)))) (local (value-triple :elided)))