Headlight Options (LED) for new light system 1.40

For lighting system introduced in v1.40

This mod

- Adds choice of Halogen or LED headlights for Anthem, Cascadia, and 49x.

(SCS includes LED headlight definitions; I made them available at the dealers.)

- For all SCS trucks

- Lengthens high beams' ranges.

- Widens low beams' angles.

Plan is to add some mod trucks after they're updated to v1.40.

This mod does not affect accessory lights.