Have a single port#343

Allowing you to set which port you use for connecting. I have a firewall that blocks a bunch of ip’s but I don’t want to disable it just for slippi, I can allow connections through a specific port however, so if I could set it or if a default one was added then that’d be great. Another solution would be a public ip list, but that’d allow ddossing

if you can’t disable your firewall for specific apps, you should probably get a different firewall