Consider adding a version number to checklists

[mbrat2005]

Currently, when checklists are shared around, there is no indication of when the checklist content was imported. For example, if an XLSX file is being passed around to bypass client-side restrictions on macros, the spreadsheet may contain outdated content depending on when it was generated.

Consider adding a version number or "Imported Date" to the pre-generated XLSX files and to the macro import checklist action.