Add plumbing for the SceneObjectDeleter to wait for the script engine to

allow final deletion of objects. Meant to support the attach(NULL_KEY) event,

OpenSim/Region/ScriptEngine/DotNetEngine/ScriptEngine.cs

@@ -476,5 +476,10 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
         {
             return "";
         }
+
+        public bool CanBeDeleted(UUID itemID)
+        {
+            return true;
+        }
     }
 }

OpenSim/Region/ScriptEngine/Interfaces/IScriptInstance.cs

@@ -95,6 +95,7 @@ namespace OpenSim.Region.ScriptEngine.Interfaces
         UUID GetDetectID(int idx);
         void SaveState(string assembly);
         void DestroyScriptInstance();
+        bool CanBeDeleted();
 
         IScriptApi GetApi(string name);
 

OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs

@@ -991,5 +991,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.Instance
         {
             get { return m_RegionID; }
         }
+
+        public bool CanBeDeleted()
+        {
+            return true;
+        }
     }
 }

OpenSim/Region/ScriptEngine/XEngine/XEngine.cs

@@ -1241,5 +1241,14 @@ namespace OpenSim.Region.ScriptEngine.XEngine
                 return "";
             return instance.GetXMLState();
         }
+
+        public bool CanBeDeleted(UUID itemID)
+        {
+            IScriptInstance instance = GetInstance(itemID);
+            if (instance == null)
+                return true;
+
+            return instance.CanBeDeleted();
+        }
     }
 }