[Feature]: Running rootless, port sharing

[radiumatic]

Hi,

First of all, thanks! This is an amazing project.

I think an option allowing pseudo-port-sharing, without Layer 2/3 networks, on one or both sides, would be awesome. It allows using the connection as a proxy in termux until someone builds an android client. (Which also could end up making weron a good trojan tool? as far as I remember jpillora/chisel has this problem with AVs on windows)

A switch hinting the system to treat one node as a gateway would also be a great feature.