Create Hatch using entities

[DomCR]

I'm not sure how Autocad handles the entities in the BoundaryPath I think they are only used as a reference, meaning that if you change the entity size the hatch is updated as well, but as far as I know, to draw a Hatch you need to create the edges, adding the entity doesn't do the trick.

So this line boundaryPath.Entities.Add(circle); is not creating anything, only referencing (I think).

Originally posted by @DomCR in #466 (comment)