Move the userlist code in a separate file

www/common/cryptpad-common.js

@@ -7,11 +7,12 @@ define([
     '/common/common-hash.js',
     '/common/common-interface.js',
     '/common/common-history.js',
+    '/common/common-userlist.js',
 
     '/common/clipboard.js',
     '/common/pinpad.js',
     '/customize/application_config.js'
-], function ($, Config, Messages, Store, Util, Hash, UI, History, Clipboard, Pinpad, AppConfig) {
+], function ($, Config, Messages, Store, Util, Hash, UI, History, UserList, Clipboard, Pinpad, AppConfig) {
 
 /*  This file exposes functionality which is specific to Cryptpad, but not to
     any particular pad type. This includes functions for committing metadata
@@ -84,6 +85,9 @@ define([
     common.findStronger = Hash.findStronger;
     common.serializeHash = Hash.serializeHash;
 
+    // Userlist
+    common.createUserList = UserList.create;
+
     // History
     common.getHistory = function (config) { return History.create(common, config); };