* Extended Script API with GetRandomAvatar

* The script will now get a IScriptEntity to it's host object with get/sets
* The script gets a IScriptReadnlyEntity interface to entities other than the host object.
* the test script now follows a random avatar.

OpenSim.RegionServer/world/scripting/IScriptContext.cs

@@ -7,7 +7,7 @@ namespace OpenSim.RegionServer.world.scripting
 {
     public interface IScriptContext
     {
-        bool MoveTo(LLVector3 newPos);
-        LLVector3 GetPos();
+        IScriptEntity Entity { get; }
+        bool TryGetRandomAvatar(out IScriptReadonlyEntity avatar);
     }
 }