Fixes reset propagation for atmospheric alarm receivers, adds CVar for fire alarm all access (#11020)

* adds a check for if a firelock is powered before auto-opening

* fixes issue where resets would not propagate properly

* adds cvar bound for fire alarm access (defaults to all access)

Content.Shared/CCVar/CCVars.cs

@@ -1185,6 +1185,18 @@ namespace Content.Shared.CCVar
         public static readonly CVarDef<float> GhostRoleTime =
             CVarDef.Create("ghost.role_time", 3f, CVar.REPLICATED);
 
+        /*
+         * Fire alarm
+         */
+
+        /// <summary>
+        ///     If fire alarms should have all access, or if activating/resetting these
+        ///     should be restricted to what is dictated on a player's access card.
+        ///     Defaults to true.
+        /// </summary>
+        public static readonly CVarDef<bool> FireAlarmAllAccess =
+            CVarDef.Create("firealarm.allaccess", true, CVar.SERVERONLY);
+
         /*
          * PLAYTIME
          */