Move admin/queue to src/Module

- Add Module\Admin\Queue class
- Add route for admin/queue[/deferred]
- Add queue admin aside menu entry
- Remove obsolete templates/admin/queue.tpl from base and frio
- Move templates/admin/workerqueue.tpl to templates/admin/queue.tpl
- Remove admin_page_workerqueue and admin_page_workerqueue_post from mod/admin.php
- Update admin/summary.tpl with new queue admin paths

src/App/Router.php

@@ -130,6 +130,8 @@ class Router
 			$collector->addRoute(['GET', 'POST'], '/features'               , Module\Admin\Features::class);
 			$collector->addRoute(['GET']        , '/federation'             , Module\Admin\Federation::class);
 
+			$collector->addRoute(['GET']        , '/queue[/deferred]'       , Module\Admin\Queue::class);
+
 			$collector->addRoute(['GET', 'POST'], '/themes'                 , Module\Admin\Themes\Index::class);
 
 			$collector->addRoute(['GET', 'POST'], '/tos'                    , Module\Admin\Tos::class);