Support IMDv2 packets types - `IMD_KILL`, `IMD_IOERROR` and `IMD_MDCOMM`

[amruthesht]

Feature request

Support for sending IMDv3 packet types - IMD_KILL, IMD_IOERROR and IMD_MDCOMM

[orbeckst]

Note that MDCOMM is already covered by #45 .