[C++] Rename Qt5 to Qt (#9490)

* rename qt5 to qt

* rename, update

* rename qt5 to qt in the templates

* update doc

samples/client/petstore/cpp-qt/client/PFXHttpFileElement.h

@@ -0,0 +1,47 @@
+/**
+ * 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.
+ *
+ * The version of the OpenAPI document: 1.0.0
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+#ifndef PFX_HTTP_FILE_ELEMENT_H
+#define PFX_HTTP_FILE_ELEMENT_H
+
+#include <QJsonValue>
+#include <QMetaType>
+#include <QString>
+
+namespace test_namespace {
+
+class PFXHttpFileElement {
+
+public:
+    QString variable_name;
+    QString local_filename;
+    QString request_filename;
+    QString mime_type;
+    void setMimeType(const QString &mime);
+    void setFileName(const QString &name);
+    void setVariableName(const QString &name);
+    void setRequestFileName(const QString &name);
+    bool isSet() const;
+    bool fromStringValue(const QString &instr);
+    bool fromJsonValue(const QJsonValue &jval);
+    bool fromByteArray(const QByteArray &bytes);
+    bool saveToFile(const QString &variable_name, const QString &local_filename, const QString &request_filename, const QString &mime, const QByteArray &bytes);
+    QString asJson() const;
+    QJsonValue asJsonValue() const;
+    QByteArray asByteArray() const;
+    QByteArray loadFromFile(const QString &variable_name, const QString &local_filename, const QString &request_filename, const QString &mime);
+};
+
+} // namespace test_namespace
+
+Q_DECLARE_METATYPE(test_namespace::PFXHttpFileElement)
+
+#endif // PFX_HTTP_FILE_ELEMENT_H