New headlights in documentation

[mattmiddlesworth]

There are some new headlights that would be good to update the documentation on. The Model X projector headlights and M3 highland.

[Fisico]

@mattmiddlesworth
My observations in xlights with the latest showfile from here:

• Inner and outer main beams are flipped
• Signatures do nothing
• The light band below the main beams reacts to ch4-6 (fade control on channel 4).
• The light band is not segmented

Everything else works as expected.
On the car, the rear fog lights and rev lights are in the bumper. The turn signals in the bumper are controlled in paralell with the back turns.