code refactoring for adding support to multiple "comics views"

two "comics views" added, classic (flow+table_view) and grid (based on qml/qtquick)
TODO: the views are only interchangeable in compilation time, some more work is needed for doing it in run time.
fixed reloadCovers

YACReaderLibrary/yacreader_local_server.h

@@ -21,6 +21,7 @@ public slots:
 	bool isListening();
 	void sendResponse();
 	static bool isRunning();
+    void close();
 private:
 	//void run();
 	QLocalServer * localServer;