Safe renderer animation support

I would like to be able to define Animations to Safe renderer objects where animation would be executed on non safe side and final place of the sefe item would be rendered again from safe side.

There should be a static analysis of animations and duration of the animation is defined at compile time to safe renderer. This makes sure that animation time is not exceeded dynamically. If animation is not yet completely done safe renderer will still render safe item after animation period.

This could also be used as nice demo where we first show nice animation flow and then dynamically make animation last longer so user is able to see that it's guaranteed that safe renderer will always render item after period defined in QML animation.

Need this to be driven by a customer with a real use case.