[C++] Adjust the names (script, sample folder, generator) to lang option (#220)

* Rename script: qt5-petstore.sh -> cpp-qt5-petstore.sh

* Rename sample folder: qt5cpp -> cpp-qt5

* Rename script: cpprest-petstore.sh -> cpp-restsdk-petstore.sh

* Rename sample folder: cpprest -> cpp-restsdk

* Rename generator: CppRestClientCodegen -> CppRestSdkClientCodegen

* Rename script: tizen-petstore.sh -> cpp-tizen-petstore.sh

* Rename sample folder: tizen -> cpp-tizen

* Rename script(security): qt5cpp-petstore.sh -> cpp-qt5-petstore.sh

* Rename sample folder(security): qt5cpp -> cpp-qt5

* Rename script(windows): qt5cpp-petstore.bat -> cpp-qt5-petstore.bat

* Change sample folder

* Rename script(windows): cpprest-petstore.bat -> cpp-restsdk-petstore.bat

* Change sample folder

* Rename script(windows): tizen-petstore.bat -> cpp-tizen-petstore.bat

* Change sample folder

* Change output folder: tizen -> cpp-tizen

* Rename the scripts under bin/openapi3

cpp-restsdk is not exist under bin/openapi3

* Change sample folder

samples/client/petstore/cpp-restsdk/HttpContent.cpp

@@ -0,0 +1,86 @@
+/**
+ * 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 "HttpContent.h"
+
+namespace org {
+namespace openapitools {
+namespace client {
+namespace model {
+
+HttpContent::HttpContent()
+{
+}
+
+HttpContent::~HttpContent()
+{
+}
+
+utility::string_t HttpContent::getContentDisposition()
+{
+    return m_ContentDisposition;
+}
+
+void HttpContent::setContentDisposition( const utility::string_t & value )
+{
+    m_ContentDisposition = value;
+}
+
+utility::string_t HttpContent::getName()
+{
+    return m_Name;
+}
+
+void HttpContent::setName( const utility::string_t & value )
+{
+    m_Name = value;
+}
+
+utility::string_t HttpContent::getFileName()
+{
+    return m_FileName;
+}
+
+void HttpContent::setFileName( const utility::string_t & value )
+{
+    m_FileName = value;
+}
+
+utility::string_t HttpContent::getContentType()
+{
+    return m_ContentType;
+}
+
+void HttpContent::setContentType( const utility::string_t & value )
+{
+    m_ContentType = value;
+}
+
+std::shared_ptr<std::istream> HttpContent::getData()
+{
+    return m_Data;
+}
+
+void HttpContent::setData( std::shared_ptr<std::istream> value )
+{
+    m_Data = value;
+}
+
+void HttpContent::writeTo( std::ostream& stream )
+{
+    m_Data->seekg( 0, m_Data->beg );
+    stream << m_Data->rdbuf();
+}
+
+}
+}
+}
+}