For lighting system introduced in v1.40

This mod . . .
- Adds choice of Halogen, LED, or Xenon headlights for all SCS trucks. (SCS includes headlight definitions; I made them available at the dealers.)
- Widens low beams' angles.
- Lengthens high beams' ranges.


version for mod trucks is on GOOGLE DRIVE: 
https://drive.google.com/file/d/1iSwWpmfkNlMNldS5B0USF_WkuCL07e_f/view?usp=sharing

- Freightliner FLB edited by Harven
- Kenworth W990 edited by Harven
- Mack R Series
- Peterbilt Viper2 v2.3.1 (test update for 1.40)
