fix(src/app/clipboard/Clipboard): remove useless clipboard component in app folder

linphone-desktop/src/app/clipboard/Clipboard.cpp

-/*
- * Clipboard.cpp
- * Copyright (C) 2017  Belledonne Communications, Grenoble, France
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- *  Created on: May 30, 2017
- *      Author: Ronan Abhamon
- */
-
-#include "Clipboard.hpp"
-
-// =============================================================================

linphone-desktop/src/app/clipboard/Clipboard.hpp

-/*
- * Clipboard.hpp
- * Copyright (C) 2017  Belledonne Communications, Grenoble, France
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- *  Created on: May 30, 2017
- *      Author: Ronan Abhamon
- */
-
-#ifndef CLIPBOARD_H_
-#define CLIPBOARD_H_
-
-#include <QObject>
-
-// =============================================================================
-
-class Clipboard : public QObject {
-  Q_OBJECT;
-
-  Q_PRO
-};
-
-#endif // ifndef CLIPBOARD_H_