Ref T644, allow to fetch notifications sounds from an arbitrary directory

* added settings
* utility functions

src/blackmisc/audio/audiosettings.cpp

@@ -12,6 +12,8 @@
 #include <QtGlobal>
 #include <QStringBuilder>
 
+#include "blackmisc/fileutils.h"
+
 using namespace BlackMisc::Audio;
 
 namespace BlackMisc
@@ -40,6 +42,19 @@ namespace BlackMisc
             }
         }
 
+        void CSettings::setNotificationSoundDirectory(const QString &dir)
+        {
+            QString d = dir.trimmed();
+            if (d.isEmpty())
+            {
+                // reset
+                m_notificationSoundDir.clear();
+                return;
+            }
+            d = CFileUtils::fixWindowsUncPath(d);
+            m_notificationSoundDir = d;
+        }
+
         QString CSettings::convertToQString(bool i18n) const
         {
             Q_UNUSED(i18n);