gui: reset options, notify user about the backup creation

src/qt/optionsdialog.h

@@ -8,6 +8,7 @@
 #include <QDialog>
 #include <QValidator>
 
+class ClientModel;
 class OptionsModel;
 class QValidatedLineEdit;
 
@@ -45,6 +46,7 @@ public:
         TAB_NETWORK,
     };
 
+    void setClientModel(ClientModel* client_model);
     void setModel(OptionsModel *model);
     void setMapper();
     void setCurrentTab(OptionsDialog::Tab tab);
@@ -72,6 +74,7 @@ Q_SIGNALS:
 
 private:
     Ui::OptionsDialog *ui;
+    ClientModel* m_client_model{nullptr};
     OptionsModel *model;
     QDataWidgetMapper *mapper;
 };