CellLink not generated for form checkboxes

[BZValoche]

Description

One should be able to link cellsd to checkboxes. The library explicitely only allows the CellLink property on scrollbars and spin buttons.

Additional context

No response

Validations

• Check that there isn't already an issue that requests the same feature to avoid creating a duplicate.

[BZValoche]

In vml.go on line 743, you might want to add the case for checkboxes.

[xuri]

Thanks for your issue. I added support for set cell link for check box, note that if a cell link is set for a checkbox form control, Excelize will not assign a value to the linked cell when the checkbox is checked. To reflect the checkbox state, please use the SetCellValue function to manually set the linked cell's value to true. Please upgrade to the master branch code by go get github.com/xuri/excelize/v2@master, and this feature will be released on the next version.

[BZValoche]

Thansk your quickly taking it into account