Beta Altitude 1.5

Hotfix for version 1.5 of Altitude :

- Overhaul 80 % of global textures
- Overhaul all firs normals, colors and imposters
- Overhaul all meshes errors
- Overhaul 70 % of meshes for optimisation
- Overhaul ambiance lighting
- Add 5 km of asphalt with 2 tunnels and a reservoir
- Add the bus shelter (no collision for the moment, this mesh is a charpenter project and have no simplifications)
- Remove the old space hole and create a new one in an other place
(this space hole is not finished, only 70% approximate) Find the vortex!!
- Remove the brigdes near the big jump and replace by a nice road along the cliff.
- Correct tire bursting problems with some collision meshes.
- Correct some terrain shapes how broke the driving experience before
- Delete the arena (make an other thing at this place later)
- Add 2 different skybox
- Add mountains background
- Add AI working on all bridges and tunnels
- Replace original aspen bushes by new models and textures.
- Add a new ground cover
- And add four differents version of the map

And sorry I have killed the squirrel

Problem know :
-The long time to load the map.
- Multi spawn only work on the main version of the map
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WARNING : you must delete all Altitude previous files in your mod folder and in the cache, in document/beamngDrive/cache, if you want no conflict!