Readded special client permissions

Also added a command that requires a password to gain the permissions.
I think they were never vulnerable in the first place, gamerfood was just trying to intimidate us.

Subsurface/Source/Networking/NetworkMember.cs

@@ -19,6 +19,8 @@ namespace Barotrauma.Networking
 
         KickPlayer,
 
+        RequestAdminAuth,
+
         Permissions,
 
         RequestNetLobbyUpdate,