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2DSE: Added a circle shape generator. #200
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This commit implements #197 using the existing bézier curves functionality.
You can find the circle generator in the "Tools" menu of the 2D Shape Editor.
This approach has a precision limitation and uses the 4-curve graph. The radial error in this approximation will be about 0.0273% of the circle's radius. While not a perfect solution it's probably good enough in most use-cases.