async fn decode_openpgp(context: &Context, qr: &str) -> Result<Qr>Expand description
scheme: OPENPGP4FPR:FINGERPRINT#a=ADDR&n=NAME&i=INVITENUMBER&s=AUTH
or: OPENPGP4FPR:FINGERPRINT#a=ADDR&g=GROUPNAME&x=GROUPID&i=INVITENUMBER&s=AUTH
or: OPENPGP4FPR:FINGERPRINT#a=ADDR