Curved Regular Polygons

[ToddGeorgeKelly]

Added 'radius:' to all the regular polygons to make it so we can have curved corners.

I made these changes for my own purposes, so it may not fit everyone's needs, but it does work and is as simple as I could make it, so I believe it should do the job for most uses. There is one missing functionality that needs to be added before I would call it a completed update.

What it will do:

• Allow you to make any regular polygon have curved sides, I updated not only the base regular polygon code, but also the 'pre-made' shapes like Hexagon() and the others.

What it won't do currently:

• It won't, as of yet, have the inner line of the shapes be curved when using '.stroke()' or '.strokeBorder()'. I didn't need this functionality, so I haven't put any thought into how to go about this yet, but I imagine it won't be too hard to update.

A Note: I only began to teach myself to program in December of 2019 and then I took a break from March/April till November, so I may not have done everything perfectly and am definitely open to feedback.

[ay42]

@ToddGeorgeKelly this is great! Thank you.
I'll probably split it to RegularPolygon and RoundedRegularPolygon structs in the future updates so there is no corner calculations on non-rounded polygons.