comments: multiple changes on comments navigation/display logic

- toggle are smarter, they open/hide windows accorind to actions. E.g commenting opens threads
- toggle are mor explicit
- possible to hide/show only single threads
- when channelstream is enabled comments are now live-pushed to diff with NEW marker indicator
- new UI for showing thread comments

rhodecode/templates/pullrequests/pullrequest_show.mako

@@ -846,6 +846,7 @@ versionController.init();
 
 reviewersController = new ReviewersController();
 commitsController = new CommitsController();
+commentsController = new CommentsController();
 
 updateController = new UpdatePrController();
 
@@ -1002,6 +1003,8 @@ $(document).ready(function () {
         alert('okok !' + commentIds)
 
     }
+    // register globally so inject comment logic can re-use it.
+    window.commentsController = commentsController;
 
 })
 </script>