entityqueue 7.x-1.3

This version of Entity Queue helps the UX of managing queues, as well as trying to clarify the configuration of queues. It also adds basic validation to prevent queues from overwriting changes if the same queue is modified by multiple users.

**Changes since 7.x-1.2**

* #2929556: Fix breadcrumbs on custom menu callbacks.
* #2929543: Move subqueue edit callbacks into entityqueue.admin.inc.
* #2929030 by quicksketch: Make clear that using the "Entityqueue" Entity Reference behavior pulls bundles from the queue settings
* #2929017: Make "Act as queue" work with adding items to top.
* #2851188 by quicksketch, mallezie: Changed message shown when nothing happened
* #2897345 by coolestdude1: Display message on Save of Queue
* #2867823 by Pavan B S, krina.addweb: Fix coding standards
* #2851188 by mallezie, quicksketch: Changed message shown when nothing happened
* #2927031: Fix PHP notice when saving an empty queue.
* #2928485 by gordon and quicksketch: Only add items to queue when 'Add' button is clicked.
* #2928765: Allow items to be added to top of queue.
* #2928772: Do not lock the created entity reference fields.
* #2927031: Add validation to prevent overwriting changes to modified queues.