Add support for additionnal attachments (via generate_facturx_from_file())
Add factur-x lib version in Creator metadata table
Add /PageMode = /UseAttachments, so that the attachments are displayed by default when opening Factur-X PDF invoice with Acrobat Reader
Improve and enrich PDF objects (ModDate, CheckSum, Size)
Better variable names in the code that generate PDF objects
Update Factur-X XSD to v1.0 final