Split off some netpack structures into separate files

lib/networkPacks/EntityChanges.h

@@ -0,0 +1,33 @@
+/*
+ * EInfoWindowMode.h, part of VCMI engine
+ *
+ * Authors: listed in file AUTHORS in main folder
+ *
+ * License: GNU General Public License v2.0 or later
+ * Full text of license available in license.txt file, in main folder
+ *
+ */
+#pragma once
+
+#include <vcmi/Metatype.h>
+
+#include "../JsonNode.h"
+
+VCMI_LIB_NAMESPACE_BEGIN
+
+class EntityChanges
+{
+public:
+	Metatype metatype = Metatype::UNKNOWN;
+	int32_t entityIndex = 0;
+	JsonNode data;
+	template <typename Handler> void serialize(Handler & h, const int version)
+	{
+		h & metatype;
+		h & entityIndex;
+		h & data;
+	}
+};
+
+VCMI_LIB_NAMESPACE_END
+