refactor: add IDisposable to AgentTracker

Assets/Raindrop/Core/AgentsTracker.cs

@@ -9,7 +9,7 @@ namespace Raindrop
     // in particular, it tracks : 
     // region handle
     // 
-    public class AgentsTracker
+    public class AgentsTracker : IDisposable
     {
         //hashtable of agents, and the sim they are last known to reside in.
         public readonly Dictionary<UUID, NearbyAvatar> agentInfos = new Dictionary<UUID, NearbyAvatar>();
@@ -45,6 +45,10 @@ namespace Raindrop
             RegisterClientEvents(instance.Client);   
         }
         
+        public void Dispose()
+        {
+            UnregisterClientEvents(instance.Client);
+        }
         
         private void RegisterClientEvents(GridClient client)
         {
@@ -52,6 +56,13 @@ namespace Raindrop
             // client.Self.TeleportProgress += new EventHandler<TeleportEventArgs>(Self_TeleportProgress);
             client.Network.SimDisconnected += new EventHandler<SimDisconnectedEventArgs>(Network_SimDisconnected);
         }
+        
+        private void UnregisterClientEvents(GridClient client)
+        {
+            client.Grid.CoarseLocationUpdate -= new EventHandler<CoarseLocationUpdateEventArgs>(Grid_CoarseLocationUpdate);
+            // client.Self.TeleportProgress -= new EventHandler<TeleportEventArgs>(Self_TeleportProgress);
+            client.Network.SimDisconnected -= new EventHandler<SimDisconnectedEventArgs>(Network_SimDisconnected);
+        }
 
         #region eventHandlers
         void Grid_CoarseLocationUpdate(object sender, CoarseLocationUpdateEventArgs e)

Assets/Raindrop/RaindropInstance.cs

@@ -452,6 +452,12 @@ namespace Raindrop
         {
             MarkEndExecution();
 
+            if (_agentsTracker != null)
+            {
+                _agentsTracker.Dispose();
+                _agentsTracker = null;
+            }
+            
             if (Cof != null)
             {
                 Cof.Dispose();