Accept UNIX socket as destination in outbound address

[ghost]

Inbound already has UNIX support. Why not outbound so I can get faster speed & eliminate open port;

{"tag":"out-socks","protocol":"socks","settings":{"servers":[{"address":"/tmp/socks-proxy.sock","port":...
{"tag":"out-shadow","protocol":"shadowsocks","settings":{"servers":[{"address":"/tmp/shadowsocks.sock","port":...