[add] support commands: quadratic Bézier, arc #8
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To be rejected pull request as I understand, that you might not like the change from closure paradigm to prototype one.
But feel free to pick up these functions
quadraticToCubicBezierellipticArcToCubicBezierCurvesThey would allow you to cheaply support Quadratic bezier and Elliptic Arc, by transforming them to some cubic bezier curves.