Feature Request: Align Stroke a la Adobe Illustrator

[phrohdoh]

https://helpx.adobe.com/illustrator/using/stroke-object.html

[nical]

You can already do something like that by implementing your own StrokeVertexConstructor or StrokeGeometryBuilder. The provided StrokeVertex has a position_on_path, which you can move along its normaldepending on theside`.