Prepare to harmonize pointer event accessor names

...by deprecating everything that doesn't conform to the naming scheme,
and providing replacements.  Continues what was started with QWheelEvent
in 7d29807296cb7ccc7f3459e106d74f93a321c493.  However QMouseEvent::pos()
is left un-deprecated because it's so widely used.

Also quit returning QPointF by const-ref from accessors.  It's plenty
small enough to return by value; we were never consistent about it anyway;
and it's good to avoid some problems with returning a reference to a
temporary in case the value is calculated in the accessor.

[ChangeLog][QtGui][QPointerEvent] Mouse, touch and tablet events now
have a standard set of QPointF accessors: position(), scenePosition()
and globalPosition(). Existing accessors that return integer QPoints,
and those with non-standard names, have been deprecated. You can use the
clazy qevent-accessors check to update your code accordingly.

Task-number: QTBUG-20885
Task-number: QTBUG-84775
Change-Id: I8e6f587da76d6d0bca6e965ce8ebc7e67b868011
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

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