[Immersive Vehicles] IAV Parts pack

The Industrial Association of Vehicle Manufacturers is a collaborative parts pack for Immersive vehicles, adding a wide array of parts, and unique crafting recipies with custom recipies for Immersive Engineering. 

At the moment IAV related packs are:

-Mackrel Autmotive Industries (If using MAI, use the latest Beta release, marked with a blue "B". - Kevin)

-VEB Schwikau Auto Works

IAV will however work with most if not all convention compliant packs.

Currently includes

-i2, i4, i6, gasoline manual/automatic

-i4, i6, i8, v12 Diesel 

-Wheels of several designs and sizes

-Seats with an optional headrest part

-a wide array of crafting/decor items