Feature: Add support for IPv6

IPv6 support is important, especially for some users who are using it exclusively. Making the service available via IPv6 is going to be required. IPv6 status can be checked using this website : https://ipv6-test.com/validate.php

I’ve attempted this once and it didn’t go well. I’d need to ensure that it doesn’t cause issues for the server reloads anymore and that the firewall is properly configured for the handling of IPv6 data.