Spin off starting scripts in rezzed objects into a thread to avoid a recursion

into the script engine if the script was suspended inside an event.

OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs

@@ -3007,7 +3007,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                     // objects rezzed with this method are die_at_edge by default.
                     new_group.RootPart.SetDieAtEdge(true);
 
+                    Util.FireAndForget(delegate object x)
+                    {
                         new_group.ResumeScripts();
+                    });
 
                     m_ScriptEngine.PostObjectEvent(m_host.LocalId, new EventParams(
                             "object_rez", new Object[] {