reimplementaion of fix for QColorDialog on macOS Sierra bug.

doesn't use destructor because destructor causes another crash.

YACReaderLibrary/server/controllers/foldercontroller.h

@@ -0,0 +1,20 @@
+#ifndef FOLDERCONTROLLER_H
+#define FOLDERCONTROLLER_H
+
+#include "httprequest.h"
+#include "httpresponse.h"
+#include "httprequesthandler.h"
+
+class FolderController : public HttpRequestHandler {
+    Q_OBJECT
+    Q_DISABLE_COPY(FolderController);
+public:
+
+    /** Constructor */
+    FolderController();
+
+    /** Generates the response */
+    void service(HttpRequest& request, HttpResponse& response);
+};
+
+#endif // FOLDERCONTROLLER_H