CLI Interface for the client

[phnz]

If we ship the node binary we can create a CLI that we can expose admin permission to run command used by the ipv6 leak protection or the killswitch.

A draft has already been done here
https://github.com/VPNht/desktop-cli

In windows we'll need to make a service this way, from the app we can send command via a socket / port similar to openvpn management console.

The service will have admin permission so we can handle everything without a elevation required.

In mac/linux it's similar to what we already have for openvpn.
It can be a simple CLI using SETUID