Create a new file in the Excel 2007+ XLSX format.

Changes for 1.12 - 2024-02-26

• Added support for embedding images into worksheets with worksheet `embed_image()`.
• Added support for Excel 365 `IMAGE()` future.
• Added trendline equation formatting for Charts.
• Added support for leader lines to all chart types.
• Added chart option to display `N/A` as empty cells.
• Add support for `invert_if_negative` color option in Charts.
• Added worksheet `very_hidden()` method to hide a worksheet in a way that it can only be unhidden by VBA. Feature Request #228.
• ! Fixed identation and alignment property mismatch.