added client side hooks: "action:topic.loading" and "action:topic.loaded"

public/src/forum/topic.js

@@ -42,6 +42,7 @@ define(['composer', 'forum/pagination'], function(composer, pagination) {
 
 		Topic.postCount = templates.get('postcount');
 
+		$(window).trigger('action:topic.loading');
 
 		function fixDeleteStateForPosts() {
 			var postEls = document.querySelectorAll('#post-container li[data-deleted]');
@@ -1050,6 +1051,7 @@ define(['composer', 'forum/pagination'], function(composer, pagination) {
 		}
 
 		$(window).on('scroll', updateHeader);
+		$(window).trigger('action:topic.loaded');
 	};
 
 	function updateHeader() {