Added "Cashback" function.

Added "Cashback" function. Accrual of bonuses to the buyer's balance with the possibility of subsequent use and indicating the maximum percentage or amount to be debited.

Added "Cashback" function.

Added mobile version of HTML editor.Added the ability to limit the addition of goods to the basket, by its quantity in stock.Added a function to display the values selected in the search filter at the top of the page.