v1.9.0

Added

• 13 new standard page formats on PageFormat, usable anywhere a format is accepted (e.g. addPage(PageFormat::A2)):
  • ISO A series: A0, A1, A2, A7
  • ISO B series: B4, B5
  • ISO C envelopes: C4, C5, C6, DL
  • North American: TABLOID (Ledger, 11x17 in), EXECUTIVE, HALF_LETTER