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Replace direct bounds calculation with BoundsProvider interface for better performance and correctness. This makes it easier to get the correct bounds. BREAKING CHANGES: - SkeletonSprite extends FlxTypedGroup<FlxObject> rather than FlxObject. This was necessary because the FlxObject bounding/hitbox is always connected to its position and size and cannot be offset. - Removed getAnimationBounds() method. Replace it with the appropriate BoundsProvider implementation based on your use case, or create your own. - Removed setBoundingBox(). Use BoundsProvider features. - hitTest() now uses the assigned BoundsProvider instead of direct calculation. For accurate hit testing, use CurrentPoseBoundsProvider and call calculateBounds() each frame or on click. New features: - Uses BoundsProvider as starling. - SkeletonSprite constructor now accepts a third optional parameter for BoundsProvider. SetupPoseBoundsProvider is used by default. - Added calculateBounds() to recalculate bounds on demand.