Moved creation of _visualEffectView out of layoutSubviews #113
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I discovered a problem when rotating my app. It looked like it was creating a new blur effect and placing it on top of the last one. It's also expensive to create a new UIVisualEffectView on each sublayout, which can happen during animations.
To fix this, I've moved the creation of the UIVisualEffectView up where the blur effect is created. I also set the auto resizing mask, so the bounds doesn't need to be explicitly updated.