[XLSX] Fix sheet title extract function

[guillaume-ro-fr]

This is:

- [x] a bugfix
- [ ] a new feature

Checklist:

• Changes are covered by unit tests
• 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
• Documentation is updated as necessary

Why this change is needed?

XLSX extractSheetTitle returned the quote character in sheet name

Fix #739

[guillaume-ro-fr]

There is a delta between the worksheet name and the title extractor, and this impacts several functions, including Coordinate::absoluteCoordinate.
I think it is therefore necessary to modify the test condition to exclude quotes, or to modify the storage of sheet names.

[PowerKiKi]

I suppose storing in memory only non-quoted title would make sense. But I am not quite sure when quotes must be used... when writing to files only ?

[PowerKiKi]

@MarkBaker do you think it would be wise to move to have only non-quoted title in memory and quote them only when writing to files ?

[MarkBaker]

@MarkBaker do you think it would be wise to move to have only non-quoted title in memory and quote them only when writing to files ?

Without reading all the background to why this is a problem, I'm concerned that this is potentially going to cause problems for any formula that references a spreadsheet title that contains quotes

[PowerKiKi]

I'm concerned about that too. But I think it should be rather easy to unit test quoted and non-quoted sheet name in formulas to prove that it would work. If existing tests are fixed, and new tests cover our concerns, then I'd merge it.

[PowerKiKi]

This PR has been automatically closed because the develop branch was permanently deleted.

If this is still important for you, please re-submit a PR against master and mention this one in the description.