Added a constructor for the Mobile Menu. The constructor allows you to create multi-level menus, specify the displayed icons

Added a constructor for the Mobile Menu. The constructor allows you to create multi-level menus, specify the displayed icons, element colors, as well as a pop-up search filter for different types of products.

Added separation for automatic import to update and download new products.
Added new template with demo and quick install.
Added informing about unfinished purchase.