StyleSheet Rewrite

Use QDarkStyle to make Standard_Dark.qss and Standard_Light.qss
Use Widget name to stylize them.

retroshare-gui/src/gui/common/RSComboBox.h

@@ -0,0 +1,36 @@
+/*******************************************************************************
+ * gui/common/RSComboBox.h                                                     *
+ *                                                                             *
+ * Copyright (C) 2010, Retroshare Team <retroshare.project@gmail.com>          *
+ *                                                                             *
+ * This program is free software: you can redistribute it and/or modify        *
+ * it under the terms of the GNU Affero General Public License as              *
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.                         *
+ *                                                                             *
+ * You should have received a copy of the GNU Affero General Public License    *
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.       *
+ *                                                                             *
+ *******************************************************************************/
+
+#ifndef RSCOMBOBOX_H
+#define RSCOMBOBOX_H
+
+#include <QComboBox>
+
+class RSComboBox : public QComboBox
+{
+	Q_OBJECT
+public:
+	explicit RSComboBox(QWidget *parent = nullptr);
+
+protected:
+	bool eventFilter(QObject *obj, QEvent *event);
+};
+
+#endif // RSCOMBOBOX_H