Initialize the picpainter State in the QAlphaPaintEngine.

Patch by John Layt.

Analog to how the print preview problems on windows were fixed, this
is needed to correctly print e.g. web view contents.

Task-number: QTBUG-36308
Task-number: QTBUG-37240
Change-Id: If4ecffde969ed221bbbeea80232f29f095fd71cd
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: John Layt <jlayt@kde.org>
QGuiApplication: send TouchCancel when touch is interrupted by popup

QQuickWindow depends on maintaining state of known touch points
between events, so it needs to be notified when it will not be
receiving the corresponding release event for one or more.
This temporary fix needs to be reverted when we have a proper
event forwarding solution.

Task-number: QTBUG-37371

Change-Id: I5dc40af6feac425be8103c1586f8ebe3a6aad20d
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>