Attempt to give script objects a proper lease time (DNE and xengine). Relies on GC. Also removed lease for LSL_Api as it strictly speaking should not be MarshalByRef. Or should it? If so I broke scripting! :)

OpenSim/Region/ScriptEngine/Shared/Api/Runtime/ScriptSponsor.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.Remoting.Lifetime;
+using System.Text;
+
+namespace OpenSim.Region.ScriptEngine.Shared.Api.Runtime
+{
+    public class ScriptSponsor: ISponsor
+    {
+        // In theory: I execute, therefore I am.
+        // If GC collects this class then sponsorship will expire
+        public TimeSpan Renewal(ILease lease)
+        {
+            return TimeSpan.FromMinutes(2);
+        }
+    }
+}