FR: Tube lights for projectiles

Following on from configurable lights for weapons by @EatThePath, it would be useful to have configurable tube lights for standard projectiles like lasers and missiles, rather than being restricted to point lights.

Useful parameters include:

Position of head and tail ends of tube light (relative to projectile location; it's useful to be able to extend the light both forward and back from the point where the projectile exists). Note: The obvious necessity is position along the axis of movement. However, while I don't have any use cases in mind right now, the ability to position the head and tail along the other two axes would be a good thing to have, so if it's easy to add please do so.

Color, intensity, and radius of the light at its tail end.