[EXT] Adhere to IANA's TLS extensions naming (yes/no)?
TLS extensions are described in an RFC and are registered by IANA under an "official" name. In the current implementation of GnuTLS extensions are sometimes named after their official definition and sometimes have a different name. It would be good to take a standpoint here and decide whether we want to consistently adhere to this official naming or deviate from it where we see fit.