ATS - Montana Expansion EOB V0.9.9.7 (1.41.x)

v0.9.9.7
Guardrail east of Bozeman corrected, thanks TW –
US 287 work between Helena and I90 –
Fix random terrain flickering around the map –
Great Falls work –
Fix several prefabs that were updated leaving terrain holes on corners

Authors: xRECONLOBSTERx