Employing the `numSides` parameter for elliptical gen methods

[EhsanMarufi]

The useful parameter of numSides in the constructor of the internal class of Ellipse is implemented and available; why not allow the users to benefit the advantages of the parameter?! As the class provides a resolution-independent concept, one may need to have more control on the sides' count, e.g. where the shape may be scaled in a way the imperfection of the to-be elliptical curve is undesirable, and the issue could've been solved easily, if there were more sides on the shape!

[PrimaryFeather]

You're perfectly right, it makes sense to make that parameter generally available. To be honest, I don't know why I didn't do it in the first place ...

Thanks a lot for taking the time to set up the pull request!!