Add end position to contour fill

[bianchifan]

All fillstitch version accept start and end positions except the contour fill. Contourfill always starts AND ends at the start position.

[lexelby]

Yup, that's a design choice we made when we created contour fill. Maybe we'll add support for the end position in the future. I'm not quite sure what it should look like though...

[kaalleen]

Maybe it could simply travel around the outline to end up at the end position? This could be troublesome though if the end position lies inside a hole...