ATS - US 24 Extension V1.4

Version 1.4 Changelog:
-Adapted for ATS 1.47 and Promods Canada

High Poly roads/terrain has been kept from version 1.3.3.
Reduces road terrain size from 1000m to 400m.
Added trees either side to hide the "void" as it's a shorter terrain.
Reduced length of several "terrain" pieces that were hidden under the map, these are unnecessary as they are too long, and just take up extra resources.

Authors: DigitalX