ListWorksheetInfo Improvements for Xlsx and Ods

[oleibman]

Fix #3255, another oldie (3+ years). Allow the ability to only count rows and columns with data. To avoid a breaking change, keep present logic unless Reader readEmptyCells attribute is set to its non-default value, i.e. false. This adds very little overhead, and gives a result that I think many users would prefer.

It was natural to look at the equivalent code for Ods while doing this. That code turned out to be buggy. Changes there are a bugfix, so I am not concerned about BC breaks, and therefore return what I think most users would want without the need for differing results depending on readEmptyCells.

This is:

• a bugfix
• a new feature
• refactoring
• additional unit tests

Checklist:

• Changes are covered by unit tests
  • Changes are covered by existing unit tests
  • New unit tests have been added
• Code style is respected
• Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
• CHANGELOG.md contains a short summary of the change and a link to the pull request if applicable
• Documentation is updated as necessary