[ncat][RFC] Support for square-bracket notation for IPv6 proxy address

[nnposter <nnposter () users sourceforge net>]

When Ncat is acting as a proxy client, the remote proxy server is 
specified as --proxy <addr>[:<port>]. The current "flat" syntax is not 
ideal and I am proposing to adopt IPv6 square-bracket notation, such as:
```
ncat   ...   --proxy [2001:db8::1]:8080
```

More at https://github.com/nmap/nmap/issues/1441
Please review the proposal and comment.

Cheers,
nnposter
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