[C++ server] Adjust the names (script, sample folder, generator) to lang option (#250)

* Renamce C++ server scripts

* Change output folder

* Rename sample folder: pistache-server -> cpp-pistache

* Rename sample folder: restbed -> cpp-restbed

samples/server/petstore/cpp-restbed/model/Order.cpp

@@ -0,0 +1,126 @@
+/**
+ * OpenAPI Petstore
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * OpenAPI spec version: 1.0.0
+ * 
+ *
+ * NOTE: This class is auto generated by OpenAPI-Generator 3.0.0-SNAPSHOT.
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+
+
+#include "Order.h"
+
+#include <string>
+#include <sstream>
+#include <boost/property_tree/ptree.hpp>
+#include <boost/property_tree/json_parser.hpp>
+
+using boost::property_tree::ptree;
+using boost::property_tree::read_json;
+using boost::property_tree::write_json;
+
+namespace org {
+namespace openapitools {
+namespace server {
+namespace model {
+
+Order::Order()
+{
+    m_Id = 0L;
+    m_PetId = 0L;
+    m_Quantity = 0;
+    m_ShipDate = "";
+    m_Status = "";
+    m_Complete = false;
+    
+}
+
+Order::~Order()
+{
+}
+
+std::string Order::toJsonString()
+{
+	std::stringstream ss;
+	ptree pt;
+	pt.put("Id", m_Id);
+	pt.put("PetId", m_PetId);
+	pt.put("Quantity", m_Quantity);
+	pt.put("ShipDate", m_ShipDate);
+	pt.put("Status", m_Status);
+	pt.put("Complete", m_Complete);
+	write_json(ss, pt, false);
+	return ss.str();
+}
+
+void Order::fromJsonString(std::string const& jsonString)
+{
+	std::stringstream ss(jsonString);
+	ptree pt;
+	read_json(ss,pt);
+	m_Id = pt.get("Id", 0L);
+	m_PetId = pt.get("PetId", 0L);
+	m_Quantity = pt.get("Quantity", 0);
+	m_ShipDate = pt.get("ShipDate", "");
+	m_Status = pt.get("Status", "");
+	m_Complete = pt.get("Complete", false);
+}
+
+int64_t Order::getId() const
+{
+    return m_Id;
+}
+void Order::setId(int64_t value)
+{
+    m_Id = value;
+}
+int64_t Order::getPetId() const
+{
+    return m_PetId;
+}
+void Order::setPetId(int64_t value)
+{
+    m_PetId = value;
+}
+int32_t Order::getQuantity() const
+{
+    return m_Quantity;
+}
+void Order::setQuantity(int32_t value)
+{
+    m_Quantity = value;
+}
+std::string Order::getShipDate() const
+{
+    return m_ShipDate;
+}
+void Order::setShipDate(std::string value)
+{
+    m_ShipDate = value;
+}
+std::string Order::getStatus() const
+{
+    return m_Status;
+}
+void Order::setStatus(std::string value)
+{
+    m_Status = value;
+}
+bool Order::isComplete() const
+{
+    return m_Complete;
+}
+void Order::setComplete(bool value)
+{
+    m_Complete = value;
+}
+
+}
+}
+}
+}
+