Outputting URL components

Hello friends.

I'm working on this little PR that I figure could use some more visibility and 
brain storming: https://github.com/curl/curl/pull/10853

It adds ten new variables to the -w/--write-out option to allow different 
parts of the used URL to get output separately. Basically helping to split up 
the URL. Something that is very tricky to do in for example an ordinary shell 
script.

The new variables are currently called "url-[part]" and this is the complete 
list:

   url-scheme, url-user, url-password, url-options, url-host, url-port,
   url-path, url-query, url-fragment, url-zoneid

- Should we rather use a dot (.) instead of minus (-) like "url.scheme"
   instead?

- Is this generally a feature you would like?

- This feature is so far made for the *input* URL that curl operates on.
   There's also something we call the "effective URL" which is the last URL
   curl operated on, like when following a series of redirects. Should we offer
   the same set of variables for that?

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