add SimpleOSDMapHandler, for caps that have just one httpmethod and body should be decoded as OSDMap, so we don't right the same things all pver

OpenSim/Framework/Servers/HttpServer/SimpleBaseRequestHandler.cs

@@ -48,6 +48,7 @@ namespace OpenSim.Framework.Servers.HttpServer
             Name = null;
             m_path = path;
         }
+
         protected SimpleBaseRequestHandler(string path, string name)
         {
             Name = name;