Preview Col de Fouchy V 3.1 (signs and rally ambiance update) (part 3, the last)

Dear Assetto's racer, chiller,

Here some preview of the signs and rally ambiance of Col de Fouchy.

I've added some rally / wrc signs, marshalls, ambulance, start post, start light, haystack with ribbon (with collisions)

This will be future standard for every other rally layout on other mods.

I will post this update during the week.

Here the changelog of this version :

- Correction of shadow parameter

- Addition of road signs

- Addition 3D trees / bushs

- Addition of rally /circuit assets for each rally / circuit layout

- Addition of an other rally layout (Rally 10, 23.7 km)