Use a custom PDF Producer metadata field
Use a custom PDF Producer metadata field

Some (all?) versions of PDFLib do not allow setting the producer
field. In order to record that Dompdf was involved in producing
the PDF we will use a custom producer field.

dompdf/dompdf,nathanntg/dompdf,BrunoDeBarros/dompdf,BrunoDeBarros/dompdf,nathanntg/dompdf,dompdf/dompdf