Adds support for rendering checkbox controls.
Features
- Added support for updating external sheet data references in local sheets when removing external links.
- You can now render a checkbox as control and not as static picture.
- Added the ability to set image dimension and keep aspect ratio while converting workbook to images.
- You can now 'AutoFit' rows for rendering.
- Added support for getting 'PivotArea' and 'PivotFormat'.