chamfercube() OpenSCAD module

This a module for OpenSCAD to create a cube with chamfers.

Usage:
Like the build in module cube(), the first parameter is an array [x,y,z]
The second, third, and fourth parameters are for the side, top and bottom chamfers.
They can be adresses with side=, top= and bottom= too. Theese parameters work with arrays and take four values.
Each value is the deepth of a chamfer on an edge, counted clockwise.
The cube can be centered on each axis with x=true, y=true and z=true.
Each parame