Split off some netpack structures into separate files

lib/networkPacks/StackLocation.h

@@ -0,0 +1,40 @@
+/*
+ * StackLocation.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 "../ConstTransitivePtr.h"
+#include "../GameConstants.h"
+
+VCMI_LIB_NAMESPACE_BEGIN
+
+class CArmedInstance;
+class CStackInstance;
+
+struct StackLocation
+{
+	ConstTransitivePtr<CArmedInstance> army;
+	SlotID slot;
+
+	StackLocation() = default;
+	StackLocation(const CArmedInstance * Army, const SlotID & Slot)
+		: army(const_cast<CArmedInstance *>(Army))  //we are allowed here to const cast -> change will go through one of our packages... do not abuse!
+		, slot(Slot)
+	{
+	}
+
+	DLL_LINKAGE const CStackInstance * getStack();
+	template <typename Handler> void serialize(Handler & h, const int version)
+	{
+		h & army;
+		h & slot;
+	}
+};
+
+VCMI_LIB_NAMESPACE_END