Fix: How do I replace QXmlQuery and QXmlFormatter in QT6

 In Qt6, the classes `QXmlQuery` and `QXmlFormatter` have been deprecated and removed. Qt6 introduced significant changes to the XML module, and you should use the new `QXmlStreamReader`, `QXmlStreamWriter`, and other relevant classes for parsing and formatting XML data. Here's how to replace `QXmlQuery` and `QXmlFormatter` with the new Qt6 XML classes:


**Replacing QXmlQuery:**


In Qt6, `QXmlQuery` is no longer available. You should use `QXmlStreamReader` and `QDomDocument` to read and query XML data. Here's an example of how to replace `QXmlQuery`:


```cpp

// Qt6 - Replacing QXmlQuery

QXmlStreamReader xmlReader(xmlData);

while (!xmlReader.atEnd()) {

    if (xmlReader.isStartElement() && xmlReader.name() == "elementName") {

        // Process the element

    }

    xmlReader.readNext();

}

```


**Replacing QXmlFormatter:**


In Qt6, `QXmlFormatter` is also removed. You can use `QXmlStreamWriter` for formatting XML data when creating XML documents. Here's an example of how to replace `QXmlFormatter`:


```cpp

// Qt6 - Replacing QXmlFormatter

QXmlStreamWriter xmlWriter(&outputDevice);

xmlWriter.setAutoFormatting(true); // Enable automatic formatting

xmlWriter.writeStartDocument();

xmlWriter.writeStartElement("root");

xmlWriter.writeTextElement("elementName", "elementValue");

// Add more elements and data as needed

xmlWriter.writeEndElement(); // Close root element

xmlWriter.writeEndDocument();

```


Please note that the code snippets above provide a basic replacement for `QXmlQuery` and `QXmlFormatter`. You will need to adapt them to your specific XML parsing and formatting requirements. Additionally, Qt6 introduced various changes to the XML module, so it's important to consult the latest Qt documentation and resources for more in-depth guidance on working with XML in Qt6.

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