QmlProfiler: Consistently apply the d-pointer pattern to all models

Change-Id: I338291ee94f0301039c2b2e04b6c37fff66a2995
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
QmlProfiler: Don't call complete() after loading V8 model from file.

The model manager is responsible for triggering model completion.

Change-Id: I163ec824a6800d4180129f19cf920db6126b7ec5
Reviewed-by: Kai Koehne <kai.koehne@digia.com>