main: Start command line option parsing

Include the 'unix-opts' library described in
http://lispcookbook.github.io/cl-cookbook/scripting.html#parsing-command-line-arguments
for command line option parsing.

Define the options I need. We want a `--socket-url` option, and a list
of extension IDs as free arguments.

Implement the `-V` version command line argument. Thanks to JJJ
(https://stackoverflow.com/users/1337941/jjj) on Stack Overflow for
describing how to get the version number of an ASDF system:
https://stackoverflow.com/questions/11084339/getting-the-version-of-an-asdf-system/11088022#11088022

Add a new `options.lisp` file where we'll add the option parsing restart
error handling functions required by 'unix-opts'.

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