Forwarding rules

This may be well out of scope for microsocks, but it was useful for me so sharing it here: --- adds support for "forwarding rules" whereby rules of the form match_name:match_port,[user:pass@]upstream_name:upstream_port,remote_name:remote_port` cause microsocks to forward the *match* request to the *upstream* SOCKS5 server using the name *remote*. this is particularly useful for accessing webuis of devices attached to various remote private networks: one can run a private microsocks (or other SOCKS5 server) on the PC attached to the remote network, and point a local microsocks instance at that server, allowing specific names to be forwarded to the private network without affecting normal browser traffic.