South Dakota Circuit - Guyana (Multilayouts) 1.2

Mostly aesthetic & functional updates after a series of multiplayer sessions online... Track surface improvements, Undesirable Collisions removed, AI Fast Lane Spline Improvements, Improved Treelines, additional adjustmets to trackside objects, Aviation animations - AS 355 Eurocopter & C130.
NOTE: You will need the “stFlow Shader” patch for the animations to work https://www.racedepartment.com/downloads/stflow-shader.23999/.

Multiple layouts incorporated. Classic GMSRC Circuit, FIA Extension, and Endurance races are now available.
Updated fast_lane.ai for better starts, no collisions noted on the grid.
Updated track Cameras.
Pit behaviour for Trackday, Weekend Races seem acceptable. May require more modification after more thorough testing.