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/controllers/v1/covercontroller.cpp

@@ -6,6 +6,10 @@
 #include "template.h"
 #include "../static.h"
 
+using stefanfrings::HttpRequest;
+using stefanfrings::HttpResponse;
+using stefanfrings::HttpSession;
+
 CoverController::CoverController() { }
 
 void CoverController::service(HttpRequest &request, HttpResponse &response)