2015687697 - Improved /api/orders/add/ method

Added for /api/orders/add/ method: - downloading and adding files to the process description implemented via the files parameter - either a link or an array of links is passed, downloaded and added to the process description - downloading and writing the file ID in an additional field with the file type it is necessary to pass the value of the additional field as a link - implemented checks that if the type of the additional field is "file" and the URL is passed - upload the file and write the file ID in the field works in the above method both for additional process fields, and for contact and process products (within the method)