Cubes with rounded corners for openSCAD

Features

• Drop-in replacement for `cube()` function
• Design/prototype with cube() for fast preview and just replace it where needed.
• Optionally, specify a rounding radius for each cube. Default is 5% of smallest dimension
• Skip rounding of top and bottom faces with `flat_tops` module
• `cube(x)` works with both `x` as a number and a vector
• Use `$fn=4` for chamfered edges - works great with `flat_tops`, but will cause some shrinking in `z` for `round_cube`.
• `round_square` is now an option as a 2D shape

Usage

• Copy the `rounded_cubes.scad` file, and add `use