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:

it-studio@4c43fe2