Added some helper bash guys to use a virtual can for broadcast testing, as well as fitting all of the canbus stuffs into the IO handeler folder, as well as adding some stuff for serial support

Still currently fighting bugs, but outside of that I slightly updated the readme for the enduser and added the pyserial-asyncio package to the nix stuffs

Took a depressignly long time to figure out it did in fact work... N e ways I also updated the flake to take in KSU's DBC file for testing on monday, should work on adding udev rule and this package to the ksu-nixos guy here soon

now it looks for /dev/xboi and that gets defined by a udev rule found in the ksu-nixos repo, so baller

Now runner.py looks for the D_SOURCE env var to tell what data source its looking for

throwing everything into try block to prevent the serial handler from
killing the server

lol