reimplementaion of fix for QColorDialog on macOS Sierra bug.

doesn't use destructor because destructor causes another crash.

YACReaderLibrary/server/controllers/sessioncontroller.h

@@ -0,0 +1,29 @@
+/**
+  @file
+  @author Stefan Frings
+*/
+
+#ifndef SESSIONCONTROLLER_H
+#define SESSIONCONTROLLER_H
+
+#include "httprequest.h"
+#include "httpresponse.h"
+#include "httprequesthandler.h"
+
+/**
+  This controller demonstrates how to use sessions.
+*/
+
+class SessionController : public HttpRequestHandler {
+    Q_OBJECT
+    Q_DISABLE_COPY(SessionController);
+public:
+
+    /** Constructor */
+    SessionController();
+
+    /** Generates the response */
+    void service(HttpRequest& request, HttpResponse& response);
+};
+
+#endif // SESSIONCONTROLLER_H