#42 GeneralName for sender and recipient

[Martin Peylo]

So far only X509_Name (i.e. ASN.1 "Name") can be used in sender / recipient, just like in the subject of a certificate - but RFC 4210 allows for ASN.1 "GeneralName" (of with "Name" is a choice) there.

The peer would likely use the GeneralName in question in subectAltName of its certificate.

No supporting server implementation or need confirmed --> low priority.