PHP's built-in functions fputcsv and fgetcsv are not RFC-4180 compliant and include an escape character that's not defined in the spec.
This results in escaping characters that should not be escaped.
This commit disables this escaping mechanism.
* Add option to preserve empty rows when reading an XLSX file
* Add option to preserve empty rows when reading a CSV file
* Add option to preserve empty rows when reading an ODS file