[Feature request] Handling bar-codes

[DorKeinath]

For point of sales it's cumbersome to track which products are sold and to type in the price manually. It would be great, to have the option to scan the barcodes of all products a customer wants to buy and the prices are summarized, so that the wallet shows him the list of his products and the correct payment request as QR code (plus an option to do a tip or rounding up). I think that needs a database with barcodes and the prices that can be edited and an option to add new data. The name of the product of a barcode could be find in a database in already existing the lists.