Implement Preferences dialog (except language setting)

src/qt/qt_progsettings.hpp

@@ -0,0 +1,30 @@
+#ifndef QT_PROGSETTINGS_HPP
+#define QT_PROGSETTINGS_HPP
+
+#include <QDialog>
+
+namespace Ui {
+class ProgSettings;
+}
+
+class ProgSettings : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit ProgSettings(QWidget *parent = nullptr);
+    ~ProgSettings();
+    static QString getIconSetPath();
+
+protected slots:
+    void accept() override;
+private slots:
+    void on_pushButton_released();
+
+private:
+    Ui::ProgSettings *ui;
+
+    friend class MainWindow;
+};
+
+#endif // QT_PROGSETTINGS_HPP