Syslog: Send dynamic headers based on log level of the message

The code part regarding overflow was also removed as the write method 1 in any case. Different handling regarding line break etc. in one message was also removed as the function is called only containing one log line from MessageOutput.

include/SyslogLogger.h

@@ -19,6 +19,7 @@ private:
     bool isResolved() const {
         return _address != INADDR_NONE;
     }
+    static uint8_t calculatePrival(uint8_t facility, char errorCode);
 
     Task _loopTask;
     std::mutex _mutex;