refs #485 URL/URL list

* added constructor for CUrlList
* added registration of metadata of fail over class
* default port support for getPort

src/blackmisc/network/registermetadatanetwork.cpp

@@ -28,6 +28,7 @@ namespace BlackMisc
             CTextMessageList::registerMetadata();
             CUrl::registerMetadata();
             CUrlList::registerMetadata();
+            CFailoverUrlList::registerMetadata();
             CUser::registerMetadata();
             CUserList::registerMetadata();
             CVoiceCapabilities::registerMetadata();