QtIFW

RemoteObject: Do not use processEvents()

Replace the hand-written calls to processEvents() with
socket->waitForConnected(). It's unclear why this wasn't
done in the first place (maybe to keep the UI responsive
when the IFW was still single-threaded)? Anyhow, this
allows delivery of spurious events too, which can lead
to weird hang-ups.

Task-number: QTBUG-45625
Change-Id: I0ff2b85c05d0cc9d0102cf13791935be83c10536
Reviewed-by: Karsten Heimrich <karsten.heimrich@theqtcompany.com>