Add an "Exit Node" option to only route routable internet addresses (excluding private, test and special)

[JonTheNiceGuy]

Is your feature request related to a problem? Please describe.
The "Exit Node" may route to destinations not desired, e.g. RFC1918 address space. It would be useful for those who know about such things, to include a tick-box saying "exclude Bogons". A bogon is an IP address range which has not been allocated by IANA or one of their delegates.

Describe the solution you'd like
Ticking this box would change the route from 0.0.0.0/0 to a collection of routes, as listed here: https://www.cidr-report.org/bogons/allocspace-prefix.txt

Describe alternatives you've considered
You could exclude RFC1918 addresses (10/8, 172.16/12. 192.168/16), plus the RFC5737 addresses (192.0.2/24, 198.51.100/24 and 203.0.113/24) and RFC2544 (198.18/15), and the other "special" subnets (0/8, 100.64/10, 169.254/16, 192/24, 192.88.99/24, 224/4, 240/4).