BaseJob: jsonData() and prepareResult/Error()

* JSON response is stored internally in BaseJob, rather than passed
  around virtual response handlers. This allow to lazily deserialise
  parts of the JSON response when the client calls for them instead of
  deserialising upon arrival and storing POD pieces. This is
  incompatible with the current generated code, so temporarily FTBFS.
* BaseJob::loadFromJson() and BaseJob::takeFromJson() have been added
  to facilitate picking parts of the result as described above
  in derived job classes.
* BaseJob::jsonData(), BaseJob::jsonItems() and (protected)
  BaseJob::reply() for direct access to the response in its various
  forms.
* To further eliminate boilerplate code in generated job classes,
  a group of *ExpectedKeys() methods has been added - this allows to
  reflect the API definition of required response keys in a more
  "declarative" way, delegating validation to BaseJob.
* parseReply() and parseJson() pair turns to singular prepareResult().
  Thanks to all the changes above, in most cases it will not need
  overriding, unlike before.
* BaseJob::Private::parseJson() is introduced, to wrap
  QJsonDocument::parseJson() into something less verbose. This serves
  a completely different purpose to the former BaseJob::parseJson().
* BaseJob::doCheckReply() takes the place, and the name, of
  checkReply().

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