newMethod Settings::validKeys to return the known Settings keys

src/lib/common/Settings.cpp

@@ -146,6 +146,11 @@ void Settings::save(bool emitSaving)
   instance()->m_settings->sync();
 }
 
+const QStringList Settings::validKeys()
+{
+  return instance()->m_validKeys;
+}
+
 bool Settings::isWritable()
 {
   return instance()->m_settings->isWritable();

src/lib/common/Settings.h

@@ -149,6 +149,7 @@ public:
   static const QString logLevelText();
   static QSettingsProxy &proxy();
   static void save(bool emitSaving = true);
+  static const QStringList validKeys();
 
 signals:
   void settingsChanged(const QString key);