Function write_callflow_html 

pub fn write_callflow_html(
    project: Option<&Path>,
    codesynapse_out_arg: Option<&Path>,
    graph_arg: Option<&Path>,
    report_arg: Option<&Path>,
    labels_arg: Option<&Path>,
    sections_file: Option<&Path>,
    output_arg: Option<&Path>,
    _lang: &str,
    max_sections: usize,
    diagram_scale: f64,
    max_diagram_nodes: usize,
    max_diagram_edges: usize,
    verbose: bool,
) -> Result<PathBuf>