Added the ability to update when importing the "quantity of goods in stock" by a mathematical expression.

Added the ability to update when importing the "quantity of goods in stock" not only by a numerical value, but also by a mathematical expression.

Added the ability to update when importing the "quantity of goods in stock" by a mathematical expression.

Scroll mode added to Categories and Producers widgetMultiple product variants addedAdded the function of linking the mobile menu to any element (button).