Over-engineered JST connector pliers

On Printables there are many variations of pliers designed to pull [JST connector](https://en.wikipedia.org/wiki/JST_connector) plugs out of their sockets. To me, they were all sub-optimal. I decided to design some JST connector pliers that addresses all the deficiencies I found.

The original plug-pulling pliers and derivatives probably came from [Micro Center](https://www.printables.com/model/367156-jst-connector-pliers). My design is original, done from scratch in OpenSCAD, and customizable. It's even possible to make other kinds of pliers from this.

Improvements in this design over others available:
* Jaws are shorter to provide greater leverage with lesser handle force.
* Jaw teeth are parallel when pliers are open to the width of a JST plug.
* Parts snap together, and stay together, with no extra fasteners or tools.
* Large contact area between handles and hub (3X other designs) provide maximum strength at a high stress point.
* Leaf springs open the pliers automaticall