ClipperOffset.Execute returns Polytree

[frankbielig]

Clipper1 provides an offset interface where you directly get a Polytree as result. This interface is unfortunately omitted in Clipper2:

void Execute(Paths& solution, double delta);
void Execute(PolyTree& polytree, double delta);

-->

Paths Execute(double delta);

Of course, you can make a Polytree out of the path again. However, this detour is significantly slower than the direct path in Clipper1. The necessary information is certainly already available within the offset operation.

Request: Add a new function to get a Polytree from the offset operation. Alternatively, the current function could be replaced, since a Polytree can be easily converted with PolyTreeToPaths.