PHPExcel is deprecated use PHPSpreadsheet instead

[Hanmac]

The PHPExcel library is deprecated and got replaced by a better lib PHPSpreadsheet.

for this it would be better to create new Export classes.

Also PHPSpreadsheet supports different ways of Pdf export

[Hanmac]

This change seems to be easier than i thought, this user made that change already in their fork:

https://github.com/it-studio/APYDataGridBundle/commit/4c43fe260bd3c335ba8786a56d81c501813ed8b9