Adds Bob's vehicle grids to cars and locomotives.

I checked out several grid-adding mods, and none did really what I wanted, so I made my own.

It adds Locomotive Mk2 Bob grids to modded locomotives (under the assumption that modded ones are generally better than vanilla ones), and several size grids to AAI vehicles. All other (unknown) car-type vehicles get a standard car grid.

WARNING! The way AAI copies entities around to facilitate its automation means that vehicle roboports may confuse bots and the bots get stuck if used from an autonomous (or remote-ordered) vehicle.