Fix "Excel2007 found unreadable content" when saving a file that contains a newline

[SpikedCola]

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

Why this change is needed?

This fixes an issue where excel complains about "unreadable content" if a cell contains a "\n".

These 3 characters, 0x09, 0x0a, and 0x0d were originally excluded from the list of control characters, but were added back by mistake in commit 250394d.

See issue #4619.

[oleibman]

Thank you for your contribution, and my apologies for the inconvenience.