[Enhancement] Add ability to assign destination in route->outbound

[skykingisepic]

For years ASUS-Merlin offers the assignment of outbound internal IP to specific destination (0.0.0.0 or xxx.xxx.xxx.xxx) so it should be an easy add? Allow multiple instances to bypass VPN when going to certain IPs but use VPN for all others.

{ "action": "route", "inbound": "tproxy-in", "outbound": "direct-out", "source_ip_cidr": "192.168.1.10" "dest_ip_cidr": "xxx.xxx.xxx.xxx or 0.0.0.0" <- new option },