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/v2/folderinfocontroller_v2.cpp

@@ -7,6 +7,9 @@
 #include "template.h"
 #include "../static.h"
 
+using stefanfrings::HttpRequest;
+using stefanfrings::HttpResponse;
+
 FolderInfoControllerV2::FolderInfoControllerV2() { }
 
 void FolderInfoControllerV2::service(HttpRequest &request, HttpResponse &response)