Extracted StringReader and StringWriter from JsonParser

Split `Internals/` folder into `Data/`, `Deserialization/`, `Serialization/`

include/ArduinoJson/Serialization/StreamPrintAdapter.hpp

@@ -0,0 +1,39 @@
+// Copyright Benoit Blanchon 2014-2016
+// MIT License
+//
+// Arduino JSON library
+// https://github.com/bblanchon/ArduinoJson
+// If you like this project, please add a star!
+
+#pragma once
+
+#include "../Configuration.hpp"
+
+#if ARDUINOJSON_ENABLE_STD_STREAM
+
+#include "../Print.hpp"
+
+#include <ostream>
+
+namespace ArduinoJson {
+namespace Internals {
+
+class StreamPrintAdapter : public Print {
+ public:
+  explicit StreamPrintAdapter(std::ostream& os) : _os(os) {}
+
+  virtual size_t write(uint8_t c) {
+    _os << static_cast<char>(c);
+    return 1;
+  }
+
+ private:
+  // cannot be assigned
+  StreamPrintAdapter& operator=(const StreamPrintAdapter&);
+
+  std::ostream& _os;
+};
+}
+}
+
+#endif  // ARDUINOJSON_ENABLE_STD_STREAM