[New Feature] Expand Light Post Logic

[CatTanker]

Expand the possibilities and effects of light posts

Currently they light cells which causes ugly lighting effects, especially on ramps where the lighting doesn't flow nicely.

An example of this case is:

This system could be improved significantly, such as lighting individual leptons rather than entire cells, as well as allowing lights to be used on units (such as boats for night maps and certain vehicles, which is currently impossible), and maybe even allowing a small light effect when certain warheads are fired from the fire FLH position.
https://user-images.githubusercontent.com/81521710/113728228-cf0bba80-96ed-11eb-9b2b-6e44e775bacd.mp4