Mercedes Actros OM471 engine sound release 2019/04/28 1.34.x

This mod works with almost all Actros mods, since most of them use the scs definitions.
It works with the OM471 and OM473 engines of the game as well.
I also have made a small rework of some of the interior textures of the dashboard, and i will put these improvements with the mod too.
I have also made a small air horn pack. It replaces almost all the scs air horn sounds in the game.