OverbiteNX: hopefully ready for alpha testing

[Cameron Kaiser]

Let's see if it blows up your computers. You will need to do a little bit
of legwork to get it installed since there is no pre-built add-on (though I
do include pre-built binaries for the native component on Windows and macOS).
See the copious docs.

https://github.com/classilla/overbitenx

When this is working, I will host builds in Gopherspace as well.