MetaInfo cannot depend on ObjectNodeInstance.
I forward the QObject and the QmlEngine all the way through.
The commented code in metainfo.cpp is about defining a context
for the root item. The feature is basically unused, but we can bring
it back using a callback later.
Change-Id: I8f099b06c848e2faeaafc011ac6bd313192a64bd
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>
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