In order to improve the self order user experience, QR code generation
has been improved. Now, the user can reset the access_token linked to
the QR code and then regenerate them, he can also redownload the QR code
whenever he wishes.
The content of the QR code PDF has also been changed. Now, for each
table a QR code is generated and inserted in the PDF with the name of
the table and its unique identifier (access_token).
closesodoo/odoo#129100
Taskid: 3377335
Related: odoo/upgrade#4958
Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>