Introduces the message transfer module. It splits the transfer mechanics off

the IM module and makes it into a module of it's own, which can be used by
all other modules. Removes some ugly hacks. Refer to the IM module to see
how it's used. Also fixes the persistence issue (Mantis #2598)

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

@@ -2645,7 +2645,8 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             msg.Position = Vector3.Zero;// new Vector3(m_host.AbsolutePosition);
             msg.RegionID = World.RegionInfo.RegionID.Guid;//RegionID.Guid;
             msg.binaryBucket = new byte[0];// binaryBucket;
-            World.TriggerGridInstantMessage(msg, InstantMessageReceiver.IMModule);
+// TODO: Send IM
+//            World.TriggerGridInstantMessage(msg);
             // ScriptSleep(2000);
       }