Consider porting to a language that doesn't require a runtime

In contexts where you don't require a Python install for other things, including nix-gl-host drags along of python 3 as a ~100mb bump in size. For example - I have a Rust program that I package into a Docker image, and nix-gl-host ups that image size by 100mb due to its Python dep. I've ported nix-gl-host to Rust here https://github.com/arilotter/nix-gl-host-rs and it *seems* to work perfectly!