Advanced Admin Menu

Adds the following possibilities:
- open menu items on mouse hover action;
- select existing components configurations from the menu;
- view all the frontend menu items in the Menus item without entering the Menus component page;
- direct acces to some of the Extension Manager views;
- access to the Admin/Site modules component views and add new modules from the main menu;
- view the list of plugin folders and appropriate plugins inside them;
- view the list and access to the Styles and Templates views;
- show the status of different components, plugins, menu items;

Also the menu is visible when an element in the editing state.