Move JSON/XML cursors to TrackerDeserializer

Carlos Garnacho requested to merge wip/carlosg/deserializer-cursors into master

This MR reimplements JSON and XML cursor formats as a TrackerDeserializer, completing the internal transition for all TrackerSerializerFormat that are currently available.

Also, flesh out some more generic cursor tests out of the existing scattered ones, and try to exercise both cursor formats both ways (along with all connection types).

Edited by Carlos Garnacho

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