Restructure ZoneDefinitionWriting

src/ZoneCommon/Zone/Definition/ZoneDefinitionStream.h

@@ -0,0 +1,28 @@
+#pragma once
+#include <iostream>
+#include <memory>
+
+#include "ZoneDefinition.h"
+
+class ZoneDefinitionInputStream
+{
+    std::istream& m_stream;
+
+public:
+    explicit ZoneDefinitionInputStream(std::istream& stream);
+
+    std::unique_ptr<ZoneDefinition> ReadDefinition();
+};
+
+class ZoneDefinitionOutputStream
+{
+    std::ostream& m_stream;
+
+public:
+    explicit ZoneDefinitionOutputStream(std::ostream& stream);
+
+    void EmptyLine() const;
+    void WriteComment(const std::string& comment) const;
+    void WriteMetaData(const std::string& metaDataKey, const std::string& metaDataValue) const;
+    void WriteEntry(const std::string& entryKey, const std::string& entryValue) const;
+};