Add turbo speed up/down shortcuts to hotkey options

[TheTrainGoes]

Add ability to assign the turbo speed up/down shortcuts to hotkey options.

[bsstephan]

I'm not super familiar with turbo but I think this would be pretty straightforward to do.

[robschreiber]

Looks like it's already a feature. If you hold the turbo button and press up and down it'll change the turbo speed.

[TheTrainGoes]

Hey @robschreiber ,

This is for adding it to the configurable hotkey section or having it be accessible to dedicated pins.