qmldump: Fix creation of objects from QDeclarativeTypes.

qmldump: Fix creation of objects from QDeclarativeTypes.

Previously, the import statement was not necessarily set up correctly
for the type we wanted to instantiate. We simply use
QDeclarativeType::create now and thus can skip finding the right import.

Mirrors qtcreator/f326bd067d455e979b5d83195e19581a9e2fd494
Mirrors qt4.8/bdbc3ff0a32bb37a32dc4825413e60f9d75e5007

Change-Id: Ic9e652b341854941c0e6a51f49f23dfaae4f87d7
Reviewed-on: http://codereview.qt.nokia.com/1648
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>