todo: NORMALIZE OUTPUT
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EdgeClipping (a_points: Polygon, b_points: Polygon, n: Vec2): Object
source: https://github.com/juhl/collision-detection-2d
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CircleCircle (a_circle: Circle, b_circle: Circle)
source: http://www.randygaul.net/2013/03/28/custom-physics-engine-part-2-manifold-generation/
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PolygonPolygon (a_points: Polygon, b_points: Polygon, n: Vec2)
see: EdgeClipping