Remove Security's access to the crematorium on RP

[Kotlol]

After some thinking, I'd like to weigh the good and the bads for this suggestion.

GOOD:
- Security cannot access the cremator with no reason what so ever.
- Chaplain gets to do things.
- Doctors get to do things.
- Antags can hide in the crematorium to avoid being arrested for a while

BAD:
- Crematorium murders will increase... since security cannot stop it.
- Sometimes the crematorium is the only route/shortcut.
- Some stations have wonky access and blocking the crematorium might end up accidentally locking security out in areas they normally can go even though it's NOT the crematorium. (though this one is just a thought experiment, since on some stations civilians can open certain airlocks doors and on others they can't.)

That said... I am for this idea, since the crematorium sounds like a great place for murders in general and disposing the body.

But don't do this to give the chaplain a thing to do.... we don't fix the "Chaplain doesn't have much to do" problem, but nerfing other jobs. We just need to give them more incentive and more things to do.