More marker fixes#307

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Cardioid3 wants to merge 10 commits intoKozea:mainfrom

Cardioid3:master

Commits on Nov 29, 2020

Attempting to fix angles; consistency between cubic and quadratic arc cases
Cardioid3
committed

Commits on Nov 30, 2020

Fix marker angle calculation (arithmetic mean may be 180 degrees off due to the angles wrapping around)
Cardioid3
committed

Commits on Dec 1, 2020

Commits on Dec 2, 2020

Fix angles for M and z by breaking node.vertices into subpaths
Cardioid3
committed

Commits on Dec 17, 2020

Commits on Dec 29, 2020

Commits on Jan 8, 2021

Update .vertices for other shapes
Cardioid3
committed