userman: handleUserStatus() in `ctl.Login` not `ctl.Chat`
um.wes cleanup(): fix if no session available yet
um backend.waitEvents: JSONify `res.responseText` here for all event listeners
backend.waitEvents: init ID `App.User.id = backendID`

assign backend's ID implemented in 9013a2a292fcba67dd5e24fca14f5975b30e9504
instead of autogenerated User Model's ID

used in e.g. `Chat` to make this user bold
um.Chat: make this user look bold in list

uses init ID from a516061debb44e131c41729f439427fdc6ddd86b