Update server code integration for QtWebApp 1.7.11

- Adapt server code for QtWebapp namespace 'stefanfrings'
- Implement custom modifications needed by v1 controller
  via template engine
- Unify iphone and ipad templates

YACReaderLibrary/server/yacreader_http_session_store.cpp

@@ -4,6 +4,8 @@
 
 #include "httpsessionstore.h"
 
+using stefanfrings::HttpSessionStore;
+
 YACReaderHttpSessionStore::YACReaderHttpSessionStore(HttpSessionStore *sessionStore, QObject *parent)
     : QObject(parent), sessionStore(sessionStore)
 {