Add a `--web-archive` option to `ronin-recon run`

[postmodern]

Add a --web-archive DIR option to the ronin-recon run command that explicitly adds the OutputFormats::WebArchive output-format opens a Web::Archive and saves any URL values into it.

[postmodern]

On second thought, let's not add OutputFormats::WebArchive. It should be a separate option which only saves URL values into a Web::Archive object.

[postmodern]

This could also be implemented as a WebWorker, similar to web/screenshot.