Add basic network classes and message pooling

Source/Engine/Networking/NetworkConnection.h

@@ -0,0 +1,11 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Scripting/ScriptingType.h"
+
+API_STRUCT() struct FLAXENGINE_API NetworkConnection
+{
+public:
+    uint32 ConnectionId;
+};