Zvt: Add nack packet/command #45
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This PR adds a packet for the Nack (84 XX) command, to zvt.
This packet/command is somehow special, as it has not a fixed INSTR byte. Instead of INSTR the packets 2nd byte is the error code of the Nack.
The respective traits for serialization and deserialization are hand written, instead of generated using the Zvt macro, to deal with this speciality.