WIP: Belts tensioning

There's cool tool that helps with tensioning: https://github.com/Frix-x/klippain-shaketune

> McSneaky:
> Got it working following their tutorial? Or had to hack on something?

> MickNugget:
> Just a little, basically search all it's files for printer_data/config and replace it with klipper_config, I had an extra (broken) plot_graph macro that I needed to remove, other then that it works fine (edited)