* Trim null characters in Value data format
Some producers (such as the paho embedded c mqtt client) add a null
character "\x00" to the end of a message. The Value parser would fail on
any message from such a producer.
* Trim whitespace and null in all Value data formats
* No unnecessary reassignments in Value data format parser
* Update change log for Value data format fix
Joshua Powers
Paweł Żak
David Bennett
Pieter Slabbert
Cameron Sparr