Two Live Urls for a single item

[seanValtech]

Is your feature request related to a problem? Please describe.
In my Sitecore set up as well as the normal publishing targets there is one called "stage". This is used for content editors to push content for preview before pushing it out to the production site. The pages for the stage publishing target have a different domain to the main site so sometimes users would want to jump to the stage url and sometimes to the main site url.

Describe the solution you'd like
When configuring sites the option to enter two "Site URLs" for a single "Sitecore site path". This could be both in the same text field and delimited or as two rows with the same Sitecore site path and the same language.

When viewing the Quick Info for an item with two urls both Live URLs could show so the user would have the option to go to either.