Adds a pair of red taillights to the vanilla car.

I'm not sure if I'm going to do anything for mod added cars due to the possibility of different sizes and shapes, etc.

I was originally going to have a setting that kept the taillights on during the day, but my initial release I put the wrong darkness value for it, and then after fixing that I realized lights are not visible during the day, anyway, even with max brightness on the light. Oh well.