Add remotenet

[robot-dot-win]

resolves #571

Hope it's a full general-purpose configuration with a minimum of changes. Anyway, it's backward compatible.

[bc547]

This would be very handy to have... my use case is an existing nodejs application in a restricted docker container that does not allow NET_ADMIN capability or any elevated privilege. This excludes any netfilter/ip based or other network device based solution.

Only traffic to a few specific internal subnets should be sent via a socks5 proxy. All other traffic must use the default network.

(The only alternative I found is dante's socksify, but that does not seem to work properly with nodejs. Proxychains-ng works fine, but it currently is only possible to exclude ranges from being proxied)