Qt Designer: Implement property() for QAxWidgetPropertySheet.

Access the control property of the QAxWidget directly.

Task-number: QTBUG-34592

Change-Id: I7d0971ad8fc265d0443da7ae72330e2b7f3a8d70
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
(cherry picked from qttools/611ac50c1ed80bd6c6c15f2b39e720b6f7c1acb8)
Active Qt: Remove invalid memset()-call.

It uses the wrong size and is not need since the subseqent
memcpy-call overwrites it.

Task-number: QTBUG-34722
Change-Id: Ic1662454cd76a98eff11f52ad6a847c3402e37c3
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
Use the correct system font on OS X Mavericks.

Task-number: QTBUG-32789

Change-Id: I7b1988d5f74e5becd2e02274fae4d2bcc8140901
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>