[add] support commands: quadratic Bézier, arc#8

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ra-kalai wants to merge 2 commits intoPhrogz:masterfrom ra-kalai:master

+378-100

Commits on Apr 17, 2020

[add] support commands: quadratic Bézier, arc
ra-kalai
committed

Commits on May 4, 2020

fix use of global variables
ra-kalai
committed