move code to instantiate network devices to NetworkDeviceInstantiator class

src/util/NetworkDeviceInstantiator.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "../networkDevices/NetworkDevice.h"
+#include "../enums/NetworkDeviceType.h"
+#include <string>
+#include <Preferences.h>
+
+class NetworkDeviceInstantiator
+{
+public:
+    static NetworkDevice* Create(NetworkDeviceType networkDeviceType, String hostname, Preferences* preferences, IPConfiguration* ipConfiguration);
+};