Yet Another OpenSCAD Rounded Cube Library

While working on a model of a toy truck, I needed a module to make cubes with arbitrary edges rounded. Looking around, I couldn't find anything that quite did what I was looking for. [Sembiance](https://www.thingiverse.com/Sembiance)'s [OpenSCAD Rounded Cube Corners](https://www.thingiverse.com/thing:2015341) came closest, but I don't like the intersection of three cylinders look when three rounded edges come together.

I'd been playing around some with hulls around corner spheres already an