Set native parent handle property on widget.

QWidgetWindow may not exist at that point.

Task-number: QTBUG-31672
Task-number: QTBUG-32343
Change-Id: Ia74e4d9250704ac97aac17b892bc8de9a6d535fb
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
QAxServer: Enable Q_INVOKABLE methods.

Task-number: QTBUG-26011
Change-Id: I2d91941e460e816dc6e518e4a3f059a40343bd83
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
Fix call to deprecated method QPixmap::grabWidget().

Change-Id: I3bf8f22065b40b41f5914787eb8204212a191412
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>