Python: restructure settings

Change-Id: I32b3bed5581e06e981863b561b9b2f2bb125b82e
Reviewed-by: hjk <hjk@qt.io>

src/plugins/python/pythonsettings.h

@@ -39,7 +39,15 @@ signals:
 private:
     PythonSettings();
 
+    void initFromSettings(QSettings *settings);
+    void writeToSettings(QSettings *settings);
+
+    QList<Interpreter> m_interpreters;
+    QString m_defaultInterpreterId;
+    bool m_pylsEnabled = true;
+    QString m_pylsConfiguration;
+
     static void saveSettings();
 };
 
-} // PythonEditor::Internal
+} // Python::Internal