* 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/IScriptEntity.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using libsecondlife;
+
+namespace OpenSim.RegionServer.world.scripting
+{
+    public interface IScriptReadonlyEntity
+    {
+        LLVector3 Pos { get; }
+        string Name { get; }
+    }
+    
+    public interface IScriptEntity
+    {
+        LLVector3 Pos { get; set; }
+        string Name { get; }
+    }
+}