Resolve a small race condition on removing bot behaviours that might leave previous behaviour active

Also closes behaviours on disconnect instead of interrupt, though this makes no practical difference.
If existing behaviour is None, other added behavious will not take affect until None is removed (as this is an infinite wait until interrupted).

OpenSim/Tools/pCampBot/Bot.cs

@@ -214,10 +214,11 @@ namespace pCampBot
             if (!updatedBehaviours.TryGetValue(abbreviatedName, out behaviour))
                 return false;
 
-            behaviour.Close();
             updatedBehaviours.Remove(abbreviatedName);
             Behaviours = updatedBehaviours;
 
+            behaviour.Close();
+
             return true;
         }
 
@@ -299,7 +300,7 @@ namespace pCampBot
             ConnectionState = ConnectionState.Disconnecting;
               
             foreach (IBehaviour behaviour in Behaviours.Values)
-                behaviour.Interrupt();
+                behaviour.Close();
 
             Client.Network.Logout();
         }