Ability to output ProxyHistory/SiteMap URLs, Headers, Body only

[BuffaloWill]

As a user I would like to output only portions of a request or response from the ProxyHistory or SiteMap.

For example, I would like only a list of all URLs from the ProxyHistory. Currently the user has to pipe the tool through something else like jq in order to get this information.

I suggest ProxyHistory.urls for one option or ProxyHistory.urls, ProxyHistory.response.body for multiple options.