v1.18.0

Added

• Sections: Document::$followingSections (after the first section) and
  Document::sections(), Section::$start (SectionStart: NextPage,
  Continuous, EvenPage, OddPage), and DocumentBuilder::newSection().
  Each section has its own page setup and header/footer parts; every section
  but the last ends with its <w:sectPr> in the pPr of its last paragraph
  (one is added when it ends in a table). A section without a header or
  footer of a kind shows the previous section's, as in Word.
• PageSetup::$widthTwips / $heightTwips: any page size, not only a
  PaperSize (landscape when wider than tall), with pageWidthTwips(),
  pageHeightTwips() and effectiveOrientation().
• Floating pictures: Image::$position (ImagePosition) writes the picture
  as <wp:anchor> instead of <wp:inline>. On each axis it sits at an
  offset in EMU from what it is measured from (HorizontalAnchor: page,
  margin, column, character; VerticalAnchor: page, margin, paragraph,
  line) or is aligned there (PositionAlign); behindText, wrap
  (ImageWrap: none, square, top and bottom) and zOrder set how it sits
  with the text. A picture positioned on the page from a header or footer
  repeats on every page. Image::fromPx() and the builder's
  imageFromBytes(), imageFromDataUrl() and imageFromFile() take a
  position.

Changed

• DocxReader reads every section — body, page setup, start, headers and
  footers — instead of the last section's page setup and the first section's
  headers for the whole document. Code that reads only $document->section
  now sees the first section of a multi-section file; use
  $document->sections() for all of it. A page size no PaperSize matches is
  kept as a custom size instead of becoming A4.
• The HTML serializer writes every section's body, with a page break before
  each section that starts on a new page.
• An Image with a non-zero offsetYEmu and no position is now written
  floating that far below the top of its paragraph, as the property always
  described; the writer used to ignore it and write the picture inline.
• DocxReader reads an anchored picture's position into Image::$position
  (it still fills offsetYEmu, which the HTML serializer uses), so writing a
  read document keeps its floating pictures where they were.