Rename lots of stuff in DNE to reduce source code differences in the

LSL implementation files. Rename lots of stuff in XEngine for the same
reason. Move methods between interfaces. Just refactor stuff.

OpenSim/Region/ScriptEngine/Interfaces/IEventReceiver.cs

@@ -33,6 +33,7 @@ using OpenMetaverse;
 using Nini.Config;
 using OpenSim.Region.ScriptEngine.Interfaces;
 using Amib.Threading;
+using OpenSim.Framework;
 
 namespace OpenSim.Region.ScriptEngine.Interfaces
 {
@@ -42,6 +43,8 @@ namespace OpenSim.Region.ScriptEngine.Interfaces
     /// </summary>
     public interface IEventReceiver
     {
+        Scene World { get; }
+
         /// <summary>
         /// Post an event to a single script
         /// </summary>