Add properties to QGraphicsItem to change the transformations component

With the new properties it is possible to easily animate.

Setting a transform using setTransform is incompatible with thoses
properties.  Accessing thoses propeties if you set previously a
transform will give you the default values.

Acknowledged-by: Code made with Andreas. Documentation written with Thierry.
This still need a more in depth code review and documentation review.
But it is urgent to commit now because the Animation API integration depends on it.

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