Exits the script. A script normally exits when it reaches the end of its last line, but you may wish to exit if some event (say a login) does not occur. Usage example:
on error: $byebye
timer: 40
wait for: event:
goto: $Got event
$byebye:
notify: Did not find event prompt, exiting script
exit
$Got event:
timer: 0
; more commands
