Beta4

This is the same as the previous one but there were a few important bugs that had crept in that needed to be fixed. This version should be usable (and indeed was used) for the tutorials online at youtube

https://www.youtube.com/channel/UCDXYIH-HAuz1qbua7_GMo0g

The tutorial files are in the main branch. The binaries are Windows 10 64, MacOSX 10.13 64 and Ubuntu 20.04. They should work but it is actually quite easy to compile the source since it includes all the uncommon dependencies.