xlnt-community / xlnt / 0beb586f-df55-49b8-b439-6c7390fb60e4

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Outline level support (rows groupping) (#135)

To add row grouping functionality, the OutlineLevel parameter and
related settings were supported.

```
#include <contrib/libs/xlnt/include/xlnt/xlnt.hpp>
#include <iostream>

int main()
{
    xlnt::workbook wb;
    xlnt::worksheet ws = wb.active_sheet();

    // Create 4 rows, each on a new outline level
    for (int r = 1; r <= 4; ++r) {
        ws.cell(xlnt::cell_reference(1, r)).value("Level " + std::to_string(r - 1));

        auto props = ws.row_properties(r);
        props.outline_level = r - 1; // Levels 0, 1, 2, 3
        ws.add_row_properties(r, props);
    }

    // Configure outline settings
    ws.outline_settings(true, false, true, false);

    wb.save("outline_test.xlsx");
    std::cout << "Saved outline_test.xlsx" << std::endl;
    return 0;
}
```

This code will produce excel like this
<img width="210" height="152" alt="image"
src="https://github.com/user-attachments/assets/edeb83e4-dd36-4881-aa90-ddc017bbba2e"
/>

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