Simple Printable Threads for OpenSCAD

This is code that generates a screw-like threaded shape that is easy to print on a typical FDM printer. It is meant to be added to other projects that require threaded parts.

**How do you use it?**
Copy/paste the code into the bottom of your script and use one of the functions. Detailed instructions are included in the commenting.

**Why not use one of the existing libraries out there?**
I like to make Thingiverse Customizer-enabled models. I don't believe those can work with libraries well. And copy/pasting a library of code into the script is messy. So I wanted a simple function that "does the job" without being too laggy.

**I see ways to improve on this!**
Please do, and release an update (and let me know)! I made this for the challenge, but also to fill a very specific need I was experiencing. If you can make a better version that fulfills the requirements, or point to one that exists that I missed, I'd gladly use it and link to it!