Improved mountain textures

This mod for American truck simulator replaces it. Enjoy!

Changelog v2.0:
New York City, New York, USA (New York, NY, USA)
- new texture for hills behind the trees seen on the road from Redding to Reno
- new texture for the snowmountain on the route 5 from Redding to Hornbrook
- new texture for the cliffs of Grand Canyon in the Grand Canyon Village
- some other minor environmental textures corrections

Important: I have not tested the mod on any map mods like Canadream, Viva Mexico, etc. (YET), but feel free to try for yourself! Tested on ATS version 1.6