Unity-Bottler - Unity 2019.4.40f1 in a custom wine-proton bottle on FreeBSD

[es.sh]

Unity-Bottler is an installation script that utilizes proton-experimental to run Unity Editor version 2019.4.40f1 under FreeBSD.
Now finally, after 15+ hours of work, we now have an "official" way to get Unity up and running on FreeBSD. Hopefully it's useful to many!

https://github.com/es-j3/unity-bottler