CASpringAnimation can't be slowed down like a property/keyframe animation

[jverkoey]

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CASpringAnimation's duration property is more of a recommendation than a guiding force, so we can't augment the speed of the animation by multiplying the duration when slow motion is enabled. We'll need to explore other approaches to slowing down spring animations, such as modifying the spring coefficients. This is challenging because it will likely affect the character of the spring.