Customizable Curvy Bracelet

Curvy stretchy bracelet - modify the scad file, or use customizer, to create your own variant.

Take your time with the various settings - it's quite easy to pick a combination of parameters that can't possibly result in a valid bracelet!

Reworked code to:
- Remove MCAD dependency
- Build shape in 2D before extruding - LOTS faster!
Improve customizer support