MOD STOPPER FRONT CART ON DEFAULT TRAILERS FOR SPINTIRES: MUDRUNNER

Adds the function of locking the rotation of the front truck on the default trailers.

Installation is temporary: - throw from the "Temporary" folder into the root folder of the game (if mods were previously installed)
Install forever: - drop files from the "Forever" folder into the Media.zip archive on the path classes, trucks (agreeing to replace)
Multiplayer did not check