ATS - Caterpillar C18 Engine for All Trucks v2.0

Simple engine mod to add the Caterpillar C18 800hp for all trucks.
I tried to make it as realistic as possible but i’m not sure about the torque curve.
I had no idea about it’s real price so i just made it ~10k higher that the c15.
It use the original sound from SCS, so unfortunately it will be different for each trucks.

Changelog:
Support for all SCS trucks.
Lowered unlock level to 28 so it appear on the unlocked parts.
Optional for multiplayer ( It should work ).
Little tweak of engine brake.

Authors: romain27111