Display vehicle kills across all vehicles, including turret kills

[Neutronium]

This is already displayed with trains, so it would be nice to have this with all vehicles. It also puts it in line with kill stats from turrets as well. Aside from kills from striking biters/enemies, for vehicles with turrets it should also include kills from that as well. If total damage can be included also, that would be even better!

Its a small thing, but if you have some high quality tank or spidertron in 2.0, it would be cool to see how many kills it has racked up.