- Implement new process handlers for creating, reading, updating, copying, and deleting sheets in Excel files.
- Enhance the Open function to automatically create directories for file paths if they do not exist.
- Update README.md to include detailed documentation and examples for new sheet operations, improving user guidance.
- Introduce new process handlers for reading and writing rows and columns in Excel files.
- Update existing methods to utilize absolute paths for file operations, ensuring consistency.
- Add comprehensive tests for new row and column functionalities, including iterators for both.
- Implement rich text and comment handling, along with row height and column width adjustments.