CVarManager: Bring back de/serialization

Runtime/Streams/CTextOutStream.hpp

@@ -0,0 +1,14 @@
+#pragma once
+#include "Runtime/Streams/COutputStream.hpp"
+
+namespace metaforce {
+class CTextOutStream {
+  COutputStream* m_out;
+public:
+  CTextOutStream(COutputStream& out);
+
+  void WriteString(const std::string& str);
+  void WriteString(const char* str, u32 len);
+};
+}
+