Added the General parameter of the size type and the Product type for uploading to Google Merchant.

Added the General parameter of the size type and the Product type for uploading to Google Merchant. The parameter can be specified for each category. If the Size Type is not specified in the product card, then the parameter is taken from the general settings of the category in which the product is placed.

Updated format for sending data when ordering and changing order status.
Multiple product variants added
Added the ability to set a tax with automatic recalculation of the final cost.