Move grabbing API from QEventPoint to QPointerEvent

We plan to move storage of the grabbers into QPointingDevice so that
QEventPoint will store only data that does not need to persist between
deliveries of individual events. These API changes prepare for that.

addPassiveGrabber/removePassiveGrabber is a better API than
setPassiveGrabbers(), because it will never require constructing a
temporary QList just to call the function. Eventually we need to emit
signals to notify about grab changes, so it's better to have incremental
changes to the list rather than needing to iterate and find differences.

Fix up the docs.

QEventPoint IDs are no longer written in hex in debug output.
That was done in Qt 5 because an ID was a composite of device ID
with the OS-provided touchpoint ID; but since the QPointingDevice
is always available, it's more readable if the IDs are in decimal.

Change-Id: I86b9016d9b28c331ca05c7c108d9788de93fb642
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

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