Fix issue with run_setup and dronecan

[tmcadam]

This is very rough, but demonstrates a fix for the issue with dronecan failing in run_setup.py

• Creates a python virtual environment in the mLRS/common/dronecan folder.
• Installs the dependencies
• Runs the dronecan steps with the python executable from virtual env

ONLY TESTED ON LINUX!

[jlpoltrack]

Brilliant - confirming it worked for me on MacOS.

[olliw42]

oh my gosh ... that's really above my head ... and since I guess I have to maintain that scrupt "scares" me ...
we really need that?
I mean, it's super elegangt and professional, but ... over the top of my head ...

[tmcadam]

Hmmm, this is actually an unusual way of doing it, but it keeps it all in a python script, and keeps it cross-platform. I guess other option is to replace to run_setup.py with run_setup.bat(windows) and run_setup.sh(linux mac). These shell scripts can install the dronecan dependencies and run the other python scripts, that would be the more common way of doing it.

Last option is to just document the installation steps for the 4 python dependencies before running run_setup.py and let devs do it themselves. I think you still need to setup python virtual environment for this, the more recent versions of python seem to increasingly severe warnings on system-wide dependency installation.