Add check for antags in msg_admin_attack

This commit first adds a new helper proc labeled isAntag(), as well as
adding a check for antags for every instance of msg_admin_attack().

Goals of this commit:
 - Make admin ATTACK: logs indicate if attacker is an antagonist.

Note; High probability of merge conflicts, 47 files changed.

code/modules/paperwork/pen.dm

@@ -57,7 +57,7 @@
 //		M << "<span class='danger'>You feel a tiny prick!</span>"
 		. = 1
 
-	add_logs(user, M, "stabbed", object="[name]")
+	add_logs(M, user, "stabbed", object="[name]")
 
 /*
  * Sleepypens