Feature upgrade apache pdfbox

[buchen]

First draft for #4449

It switches to PDFBox 3.0.3 and falls back - in case of errors - to PDFBox 1.8.

What I am still thinking about: How to learn if and where there are differences between the PDFBox versions.

Right now, I am printing a log message. But users will most likely not notice it let alone inform us.

I wonder if we should create both versions of the extracted text, and, if there are differences, put both files into the debug text. At least we see documents that are different.

[ZfT2]

Maybe just provide a separate "beta" Version of PP with (only) pdfbox 3, post it in the forums and let the community test it?
If after a time no (bigger) failures are reported, upgrade it also in the main release...

Advantage: we will (hopefully) only deal with one pdfbox Version in future.

[buchen]

Advantage: we will (hopefully) only deal with one pdfbox Version in future.

Yes. That is the goal.

I have now made two more changes to help us learn about differences.

The extracted debug text indicates if the version is different. At least we will learn if there are differences.

And I print the diff to the log file. In case we want to better understand what the differences are. The changes so far do not make a material difference (better extraction of special characters, additional line breaks in address, etc.)