Added more PDF/UA and PDF/A-1B related code. The swift version now passes through 3 different validators.
Added more PDF/UA and PDF/A-1B related code. The swift version now passes through 3 different validators.

edragoev1/pdfjet,edragoev1/pdfjet,edragoev1/pdfjet,edragoev1/pdfjet,edragoev1/pdfjet,edragoev1/pdfjet