Merge two sets of AnimationData together. The node takes two FFrameAnimationData's as input. The output is a copy of the first FFrameAnimationData but with its AnimationData updated using the controls present in the second FFrameAnimationData's AnimationData. If the second set of AnimationData contains a key not present in the first, then an error occurs. However, the second set of AnimationData can be a sub-set of the first.