Ports /tg/ camera lights improvement!

- Ports https://github.com/tgstation/-tg-station/pull/4162
- When the AI activates camera lights, all cameras in range of the eye
will activate their lights, and deactivate once the eye moves away.

This has the side effect of providing warning to anyone in a dimly lit
area that the AI is watching. (Pssst! Traitors, hide your e-swords!)

- Toned down the lighting intensity a little (one level above /tg/, one
level below previous) to compensate.
Merge pull request #857 from GunHog/OfCamerasAndLights

Ports /tg/ camera lights improvement!