SurveyJSON was storing a lot of redundant information (every setting on
every single section/question/answer, which, in most cases, will simply
take on the default values). This was bloating the surveyJSON property in
the db, and equally as importantly, slowing down Survey because it had to
do a lot of JSON parsing on the serialised surveyJSON object.
We now factor out and store the current section/question/answer defaults
along with the surveyJSON data itself, which means that we only needs to
store properties that differ from the defaults. This results is a massive
reduction in the size of the serialized surveyJSON stored in the database,
as well as a speed-up in json parsing time.
The compression/uncompression happens transparently to the rest of Survey.
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