QQuick3DSceneManager: handle global transform nodes in a separate pass
Whenever someone creates a connection to any of the global transform releated properties for a QQuick3DNode, we inform the scene manager about it. What it means is that we need to calulate the global transform and emit changes to it whenever it changes. But knowing when it changes is costly, since it will change whenever the transform of an ancestor change (and we don't want to listen for that all the way to the root). So the scene manager will instead delay all global transform calculations to a be done in a single pass before we update instead.
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