Add ENet stubs

Source/Engine/Networking/Drivers/ENetDriver.cpp

@@ -0,0 +1,39 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#include "ENetDriver.h"
+
+#include "Engine/Core/Collections/Array.h"
+
+void ENetDriver::Initialize(const NetworkConfig& config)
+{
+}
+
+void ENetDriver::Dispose()
+{
+}
+
+bool ENetDriver::Listen()
+{
+    return false;
+}
+
+void ENetDriver::Connect()
+{
+}
+
+void ENetDriver::Disconnect()
+{
+}
+
+void ENetDriver::Disconnect(const NetworkConnection& connection)
+{
+}
+
+bool ENetDriver::PopEvent(NetworkEvent* eventPtr)
+{
+    return true; // No events
+}
+
+void ENetDriver::SendMessage(NetworkChannelType channelType, const NetworkMessage& message, Array<NetworkConnection, HeapAllocation> targets)
+{
+}