Removed boosts (replaced with equivalent on std 14/17/20)
Removed manual json library implementation using boost and added nlohmann-json
So two additional libraries will be needed to compile:
asio, nlohmann-json (see wiki)
Also removed OTGZ support by default and disabled it, making it optional (needs to be enabled). Anyone who wants to use it will need to activate this, I think it's ideal since few should use it, so a majority don't use it, which is fairer that those who need to activate it to use it than those who don't need to have this in their program.
Added GitHub Actions workflow for Windows (vs 2022) and Ubuntu 22.04
Clean git repository since the old svn / git mess was pretty much
unrecoverable unfortunetly. I would have liked to keep the history
for posterity, but that proved to be a futile quest.
