Teletype: add support for ranges as input, e.g. "4-7 9 12-14"

This allows to quickly select lots of entries instead of having to list them all.

Example with needrestart:

Restarting services...
Daemons using outdated libraries
--------------------------------
  1. cups-browsed.service  3. NetworkManager.service  5. none of the above
  2. cups.service          4. upower.service
(Enter the items you want to select, separated by spaces.)
Which services should be restarted? 1-4
 systemctl restart cups-browsed.service cups.service NetworkManager.service upower.service