Add a short cooldown to the traitor invisability cloaker.

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The cloaker isn't useless at all, though. It's actually still significantly more useful than the chameleon projector and portable cloaking field, it just isn't the unstoppable godmode device it used to be. Its diminished usage rate is just a matter of perception, and the fact that invisibility really isn't terribly useful when you can't just openly murder people in plain sight with no risk of retaliation while using it.