Added some place holder classes for various modules.

Some work on the asset cache, can people please test this. including on one of the public systems so we can see if it causes problems with multiple users.

OpenSim/Region/Application/OpenSimMain.cs

@@ -102,6 +102,7 @@ namespace OpenSim
             }
 
             ReadConfigSettings(startupSource);
+           
         }
 
         protected void ReadConfigSettings(IConfigSource configSource)
@@ -124,6 +125,7 @@ namespace OpenSim
             m_networkServersInfo.loadFromConfiguration(configSource);
         }
 
+
         /// <summary>
         /// Performs initialisation of the scene, such as loading configuration from disk.
         /// </summary>