WS2P: allow `upnp: true` combined with `port` and/or `remoteport`
Today if we use upnp: true, then Duniter ignores the port and remoteport option. This means that we can't precise the ports we want to be opened by UPnP. UPnP decides of everything currently.
I would like to be able to choose which ports UPnP will use.
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