semiRoundedCube openscad module

Openscad module that allows easy creation of semi-rounded cubes.
Essentially it works as normal cube operation but takes a radius parameter that chamfers 8 of the edges, thus also chamfering the top and not just the vertical ones.

This version was made upon request as a easy way to make objects that will merge multiple cubes. The bottom surface is not chamfered so will be a good mating surface.

Warning: Will be heavier to process than a edges-only type rounding.

Warning 2: Make sure