• SRTO_BINDTODEVICE - fix the doc, it says you cat set it on a group
• SRTO_CONGESTION
• SRTO_EVENT - readonly
• SRTO_GROUPCONNECT
• SRTO_GROUPTYPE - readonly
• SRTO_ISN - readonly
• SRTO_KMSTATE - readonly
• SRTO_RCVDATA - readonly
• SRTO_RCVKMSTATE - readonly
• SRTO_RENDEZVOUS
• SRTO_SENDER
• SRTO_SNDDATA - readonly
• SRTO_SNDKMSTATE - readonly
• SRTO_STATE - readonly
• SRTO_TRANSTYPE
• SRTO_TSBPDMODE
• SRTO_VERSION - readonly

This PR

Readonly (NOTSUP - INVAL):

• SRTO_ISN: // read-only
• SRTO_STATE: // read-only
• SRTO_EVENT: // read-only
• SRTO_SNDDATA: // read-only
• SRTO_RCVDATA: // read-only
• SRTO_KMSTATE: // read-only
• SRTO_VERSION: // read-only
• SRTO_PEERVERSION: // read-only
• SRTO_SNDKMSTATE:
• SRTO_RCVKMSTATE:
• SRTO_GROUPTYPE: // read-only

Socket- or link-specific (NOTSUP - INVAL):

• SRTO_SENDER: // deprecated (1.2.0 version legacy)
• SRTO_IPV6ONLY: // link-type specific
• SRTO_RENDEZVOUS: // socket-only
• SRTO_BINDTODEVICE: // socket-specific
• SRTO_GROUPCONNECT: // listener-specific
  LOGC(gmlog.Error, log << "group option setter: this option ("<< int(optName) << ") is socket- or link-specific");
  throw CUDTException(MJ_NOTSUP, MN_INVAL, 0);
• SRTO_CONGESTION : not allowed
• SRTO_TRANSTYPE: not allowed
• SRTO_TSBPDMODE : not allowed now

Work within #3074.