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Improve JSON serialization/deserialization performance

Alexander Lohnau requested to merge work/alex/benchm into master

We don't need to convert the data to an intermediate QVariantMap just to make JSON out of it. This siginificantly improves performance. The measurements were done with 3000000 iterations each:

Before serialization: 0.0045009 msecs
Before deserialization: 0.002293 msecs

After serialization: 0.0034216 msecs (32% faster)
After deserialization: 0.001776 msecs (29% faster)

Edited by Alexander Lohnau

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