[MERGED PR] Removes the security alert HUD button

[avanth]

I'm not much of a fan of this myself, and finding myself agreeing entirely with what Chatauscours and Kotlol has written. I would rather see antags as a whole have additional new ways of dealing with the buttons, rather than having it removed. How that would happen? I'm not entirely sure yet, but I do not doubt that there is something that could be done.