move chat from feature to apps

include/features.php

@@ -118,16 +118,6 @@ function get_features($filtered = true, $level = (-1)) {
 				feature_level('photo_location',2),
 			],
 
-			[
-				'ajaxchat',       
-				t('Access Controlled Chatrooms'),          
-				t('Provide chatrooms and chat services with access control.'),
-				true,
-				get_config('feature_lock','ajaxchat'),
-				feature_level('ajaxchat',1),
-			],
-
-
 			[
 				'smart_birthdays',       
 				t('Smart Birthdays'),          

include/nav.php

@@ -417,7 +417,7 @@ function channel_apps($is_owner = false, $nickname = null) {
 	}
 
 
-	if ($p['chat'] && feature_enabled($uid,'ajaxchat')) {
+	if ($p['chat'] && Apps::system_app_installed($uid,'Chatrooms')) {
 		$has_chats = Chatroom::list_count($uid);
 		if ($has_chats) {
 			$tabs[] = [