When using the route `/report/barcode/...` in a report, wkhtmltopdf makes htpps requests on the server to retrieve the barcode image. If a lot of barcodes have to be printed, this can overload the server with too much requests and makes wkhtml crashes. With this commit, the qweb barcode widget is used to include the barcode as an img tag with inline barcode image as base64 data. closes odoo/odoo#64211 Related: odoo/enterprise#15619 Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>