Staff of Animated Statue Fixes and Nerfs

Player controlled animated statues that ghost won't start attacking everyone, they'll just stalk people without attacking. Fixes #2958

A player controlled animated statue will only last as long as the statue would have lasted,at the end of the time the player is released from the statue as usual, and no longer has any onus to not fuck up the wizard. Since the timer is four byond minutes and flesh to stone is one byond minute a wizard shouldn't be able to have more than four animated statues at any given time unless they upgrade the flesh to stone spell

NOTE: this also means you can't use animate statues to "kill" a target, they'll recover eventually, and even if the round ends before they do, it still won't count.