Provide handy variables to custom scripts

[Magissia]

Hello, I am suggesting to provide some handy variables to custom scripts.

Like "$IPTABLES" we could make use of a "$LAN_IP" that correspond to the current lan range, "$LAN_IPV6" (same for IPv6, not local link) "$CURRENT_PROFILE" to gives current AFwall profile ID or name.

Yes, I know IPv6 are internet routable, but you may still want to do stuff specific to the range you own, like deny port 22 if IPv6 isn't from your range.