Issue title: Integrate Ivory Car Pack (civ cars)
 Issue body: This pack would allow for a large amount of variety in the civilian vehicles in the game. 

Would also be a place to try making additive civ templates, i.e. do not replace existing entries, while keeping loading separate.
 Comments: 
 Comment 0: https://steamcommunity.com/sharedfiles/filedetails/?id=1888644057
 Comment 1: done
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