Adaptions to latest vatlib

The latest vatlib fixes some ambigious methods in the interface and
makes them more clear. Additional it adds a severity level to the
log handlers. Both causing the header to be source incompatible and
therefore need smaller changes in swift.

src/blackcore/voice_vatlib.h

@@ -100,7 +100,7 @@ namespace BlackCore
             }
         };
 
-        static void voiceErrorHandler(const char *message);
+        static void voiceLogHandler(SeverityLevel severity, const char *message);
 
         QScopedPointer<VatAudioService_tag, VatAudioServiceDeleter> m_audioService;
         QScopedPointer<VatUDPAudioPort_tag, VatUDPAudioPortDeleter> m_udpPort;