Support on ipv6 streaming

[TheRainstorm]

I want to streaming over ipv6 network. However wolf only listen on ipv4 for now. Sunshine does supports IPv6, so maybe its implementation can be referred.

sudo ss -nlp |grep wolf
u_str LISTEN 0      4096      /tmp/sockets/wayland-1 13827879        * 0    users:(("wolf",pid=43843,fd=93)) 
u_str LISTEN 0      4096      /tmp/sockets/wayland-2 14164084        * 0    users:(("wolf",pid=43843,fd=122))
u_seq LISTEN 0      128    @cuda-uvmfd-4026533524-1@ 7927072         * 0    users:(("wolf",pid=43843,fd=10)) 
udp   UNCONN 0      0                        0.0.0.0:47999     0.0.0.0:*    users:(("wolf",pid=43843,fd=21)) 
udp   UNCONN 213760 0                        0.0.0.0:48100     0.0.0.0:*    users:(("wolf",pid=43843,fd=137))
udp   UNCONN 213760 0                        0.0.0.0:48200     0.0.0.0:*    users:(("wolf",pid=43843,fd=175))
udp   UNCONN 0      0                              *:48100           *:*    users:(("wolf",pid=43843,fd=138))
udp   UNCONN 0      0                              *:48200           *:*    users:(("wolf",pid=43843,fd=176))
tcp   LISTEN 0      4096                     0.0.0.0:47989     0.0.0.0:*    users:(("wolf",pid=43843,fd=16)) 
tcp   LISTEN 0      4096                     0.0.0.0:47984     0.0.0.0:*    users:(("wolf",pid=43843,fd=31)) 
tcp   LISTEN 0      4096                     0.0.0.0:48010     0.0.0.0:*    users:(("wolf",pid=43843,fd=20))