Add IResettingEntitySystem for entity systems that do resetting cleanup (#2257)

* Add IResettingEntitySystem for entity systems that do resetting cleanup

* You got a license for that submodule update?

Content.Server/GameObjects/EntitySystems/AI/Pathfinding/Accessible/AiReachableSystem.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using Content.Server.GameObjects.Components.Access;
 using Content.Server.GameObjects.EntitySystems.AI.Pathfinding.Pathfinders;
 using Content.Shared.AI;
+using Content.Shared.GameTicking;
 using JetBrains.Annotations;
 using Robust.Server.GameObjects;
 using Robust.Shared.GameObjects.Components;
@@ -22,7 +23,7 @@ namespace Content.Server.GameObjects.EntitySystems.AI.Pathfinding.Accessible
     /// </summary>
     /// Long-term can be used to do hierarchical pathfinding
     [UsedImplicitly]
-    public sealed class AiReachableSystem : EntitySystem
+    public sealed class AiReachableSystem : EntitySystem, IResettingEntitySystem
     {
         /*
          * The purpose of this is to provide a higher-level / hierarchical abstraction of the actual pathfinding graph
@@ -134,14 +135,6 @@ namespace Content.Server.GameObjects.EntitySystems.AI.Pathfinding.Accessible
             _mapManager.OnGridRemoved -= GridRemoved;
         }
 
-        public void ResettingCleanup()
-        {
-            _queuedUpdates.Clear();
-            _regions.Clear();
-            _cachedAccessible.Clear();
-            _queuedCacheDeletions.Clear();
-        }
-
         private void RecalculateNodeRegions(PathfindingChunkUpdateMessage message)
         {
             // TODO: Only need to do changed nodes ideally
@@ -683,6 +676,14 @@ namespace Content.Server.GameObjects.EntitySystems.AI.Pathfinding.Accessible
 #endif
         }
 
+        public void Reset()
+        {
+            _queuedUpdates.Clear();
+            _regions.Clear();
+            _cachedAccessible.Clear();
+            _queuedCacheDeletions.Clear();
+        }
+
 #if DEBUG
         private void SendDebugMessage(PlayerAttachSystemMessage message)
         {