Add Close() method to IBehaviour to allow behaviours to cleanup when removed or bot it disconnected.

In this case, it is used to turn off jump when physics testing behaviour is removed.

OpenSim/Tools/pCampBot/Behaviours/AbstractBehaviour.cs

@@ -50,5 +50,7 @@ namespace pCampBot
         {
             Bot = bot;
         }
+
+        public virtual void Close() {}
     }
 }