Add new locations that allow adding menu items to the "..." menu in the queue page

Summary

It would be great to have the following locations and capabilities for the JSW queue:

This feature request includes 3 smaller requests which are correlated:

1. A new location so that vendors can add new menu items for a SD queue. (See the attached screenshot.)
2. A new location so that vendors can add new button for a SD queue. (Also see the shot.)
3. A new Atlassian Connect context parameter which allows injecting the queue ID to the URLs that are generated for the web items in point 1 and 2. Vendor's example: if I look at the queue ID=1234, then I expect the URL's linked by my custom button or menu item to include this ID.

Background

Vendor's working on the cloud version of PDF and Excel exporter apps. The server/DC version of these allow exporting issues from the queue screen, but in those version vendor can implement this with Javascript magic. This trick is not feasible in cloud, as their logic runs in a separate iframe, therefore they need the standard solution.