Roads & guard rails

Found by Jovan89 in our Discord. There were a couple objects for LS09/11 that will be uploaded separately. The bridge seemed to be missing textures, which I added.

Contains:
- 2 lane 22 degree turn XXL
- 45 degree turn (long, medium, short, XL, XXL, 2 lane XXL)
- 90 degree turn (medium, short, XL)
- Straights (long, short, long XL, 2 lane long, 2 lane long XL)
- T intersections (1 lane, 2 lane)
- Intersection
- Bridge
- Small ramp
- Guard rail (straight, left & right end points)
- Snow pole