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.