Added IRegistryCore and RegistryCore to OpenSim.Framework.

Added a ApplicationRegistry to OpenSimBase.
Changed LoadRegionsPlugin so it registers itself to that application registry.
Added a event to LoadRegionsPlugin, that is triggered when it creates a new scene ,although maybe this event should actually be in opensimBase incase other plugins are creating regions (like the RemoteAdminPlugin).

OpenSim/Framework/IRegistryCore.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenSim.Framework
+{
+    public interface IRegistryCore
+    {
+        T Get<T>();
+        void RegisterInterface<T>(T iface);
+        bool TryGet<T>(out T iface);
+    }
+}

OpenSim/Framework/RegistryCore.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenSim.Framework
+{
+    public class RegistryCore
+    {
+        protected Dictionary<Type, object> m_moduleInterfaces = new Dictionary<Type, object>();
+
+        /// <summary>
+        /// Register an Module interface.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="iface"></param>
+        public void RegisterInterface<T>(T iface)
+        {
+            lock (m_moduleInterfaces)
+            {
+                if (!m_moduleInterfaces.ContainsKey(typeof(T)))
+                {
+                    m_moduleInterfaces.Add(typeof(T), iface);
+                }
+            }
+        }
+
+        public bool TryGet<T>(out T iface)
+        {
+            if (m_moduleInterfaces.ContainsKey(typeof(T)))
+            {
+                iface = (T)m_moduleInterfaces[typeof(T)];
+                return true;
+            }
+            iface = default(T);
+            return false;
+        }
+
+        public T Get<T>()
+        {
+            return (T)m_moduleInterfaces[typeof(T)];
+        }
+
+    }
+}