Peterbilt 379 v4

I’m back!
Fixed index, several visual errors, black indicators, enhanced sounds smoke, such improved lightmask, now 13-speed gearbox, plus reversing headlamp tow hooks – currently only visual – Fixed some is Collision bug, and even a few things. Tested 1.15.1. Some things are still under “development”!
ps. scs file locked, MAN dealer!

Thanks Conte and Stas556 to let the patch!