First try at menu integration

Trying to add stereo controls to vehicle controls, using headlights as
template.
Now is a 8³-track

Because I think it's funny.

Note I did test this and the ³ (the tiny three from math class, if this
doesn't show up correctly in the comments) does show up in-game just
fine, even though it seems a little erratic in the GitHub system, they
probably use a different font.