Better lightning, insanity effects, code fixes.

Lightning flashes no longer fade slowly.
Lightning rotates with rain, so angle of directional light changes
throughout the game.
Insanity effects start occuring when a player is in view.
Cleaned up and betterified(tm) code in the CheckVisibility script.
Added fog.
Added uncontrollable, unresponsive, obsolete, outdated player to scene
for offline testing.