Add support for Toybox

[paulstraw]

Is your feature request related to a problem? Please describe.
This thing is a pain to add to other projects.

Describe the solution you'd like
Make it easy to install with Toybox

Describe alternatives you've considered
N/A

Additional context
This is a bit complex, and I don't fully understand what all would need to happen. Toybox does have support for C-based toyboxes which can run a Makefile. However, getting the C output from Nim to a usable spot is difficult. https://github.com/treeform/genny looks very worth investigating.

I think this would need CI. My current understanding of the goal would be to output:

1. .h file
2. .a file for *nix (and macOS?)
3. .lib file for Windows

Or maybe these should/have to be dynamic instead of static? Honestly, I don't know yet.