Add DTMF handling for '*' (repeat menu) and '#' (return to menu/exit)

Adds support for the following DTMF buttons:

'*' - repeats the last menu.
'#' - exits from the change folders prompt. If already in the main menu, plays bye and hangs up.
Since logging was added, console is not used directly anymore. This should use the following:

dependencies.logger.error({
  err: err
}, 'Error playing menu');