[Menus] Refactor the ManageMenuItem helper class
Created by: tinogo
The ManageMenuItem helper class should be refactored:
- Use the MenuItemsModel
The Menus/Partials/create_menu_item.tpl template should be extended with the ability to state a custom page title. It would be even better, to inject the template via a template event, to remove the hard dependency in the menus module.