[Feature Request]Add option to display Payment QR Code not only in invoice but even in order

[PhocaCz]

Add option to display Payment QR Code not only in invoice but even in order

https://www.phoca.cz/forum/viewtopic.php?p=176579#p176579

Display payment QR Code:

• in PDF invoice [✅]
• in HTML invoice [planned]
• in PDF order [planned]
• in HTML order [planned]
• as variable used in email [planned]