Allow single firewall rules to apply to both IPv4 and IPv6 simultaneously
I've added code that allows for setting a firewall rule to IPv4+IPv6
- only allows tcp/udp and icmp
- no icmp types
- no gateways or groups
Considering locking it down further to just rules with aliases.
Current issue is that when one selects WAN address, it just adds the v4 WAN address. Not both. Might need more logic in filter.inc