New transfer tool for Linux: HPex

[Liam Hays]

Like I said, HPex isn't tested with the Meta Kernel calculators. Also, my Git skills aren't too sharp, so I just push to the main branch...don't clone the repo to run HPex, since it's probably broken, get the release from the GitHub sidebar.

As for the Python versioning, I was trying to make sure that some of the newer features I'm using (typehints and dataclasses were the two features in particular).