Added viewing of the list of "Favorites" products for the administrator.

Added viewing of the list of "Favorites" products for the administrator. You can view all products from the Favorites list, as well as a list for each user separately. You can filter your favorites list by Shipment and Purchase. When you make a purchase, your favorites are automatically marked as "Purchased". A template for mailing a list of selected products has been added, and a mailing function will be added in the near future.