Fix wall visibility #6
Description
Now a wall is visible with no regards to its light conditions (you may think of it as being always illuminated).
That's because the current PlayerVisibleComponent is thought for points, not lines, and if it is applied to walls then they will appear visible even if the light is at the other side of the player viewing it. This does not seem to be an issue for now, but a perfect solution would be to count player/light count for each side and also the vicinity of a player (if a player touches a wall it does not need a light to know it exists).