When an attachment is detached to inv or derezzed, stop the scripts, update the known item with script state still in the script engine and then remove the scripts.

This is to fix a regression starting from 5301648 where attachments had to start being deleted before persistence in order to avoid race conditions with hud update threads.

OpenSim/Region/Framework/Interfaces/IEntityInventory.cs

@@ -92,7 +92,7 @@ namespace OpenSim.Region.Framework.Interfaces
         void ResumeScripts();
 
         /// <summary>
-        /// Stop all the scripts in this entity.
+        /// Stop and remove all the scripts in this entity from the scene.
         /// </summary>
         /// <param name="sceneObjectBeingDeleted">
         /// Should be true if these scripts are being removed because the scene
@@ -100,6 +100,11 @@ namespace OpenSim.Region.Framework.Interfaces
         /// </param>
         void RemoveScriptInstances(bool sceneObjectBeingDeleted);
 
+        /// <summary>
+        /// Stop all the scripts in this entity.
+        /// </summary>
+        void StopScriptInstances();
+
         /// <summary>
         /// Start a script which is in this entity's inventory.
         /// </summary>
@@ -129,7 +134,7 @@ namespace OpenSim.Region.Framework.Interfaces
         bool CreateScriptInstance(UUID itemId, int startParam, bool postOnRez, string engine, int stateSource);
 
         /// <summary>
-        /// Stop a script which is in this prim's inventory.
+        /// Stop and remove a script which is in this prim's inventory from the scene.
         /// </summary>
         /// <param name="itemId"></param>
         /// <param name="sceneObjectBeingDeleted">
@@ -138,6 +143,12 @@ namespace OpenSim.Region.Framework.Interfaces
         /// </param>
         void RemoveScriptInstance(UUID itemId, bool sceneObjectBeingDeleted);
 
+        /// <summary>
+        /// Stop a script which is in this prim's inventory.
+        /// </summary>
+        /// <param name="itemId"></param>
+        void StopScriptInstance(UUID itemId);
+
         /// <summary>
         /// Add an item to this entity's inventory.  If an item with the same name already exists, then an alternative
         /// name is chosen.