military searchlight [DO NOT MERGE IT, USE NEW PR]

Watch video (plz in better quality).

http://www.youtube.com/watch?v=h24IbcFekKk
**upd**: current version video:
http://www.youtube.com/watch?v=rNjkqA2x57M

Searchlight randomly search target while not see the player, and when user is detected, he pursues the player his spot of light.

Searchlights required plutonium generator to work, if user destroy the generator, searchlights will shut down.

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This PR increased reality and hardcore of military outposts.