• Added snakingColumns property for columns to enable newspaper-like column flow
• Added outlines / bookmarks for text node
  • outline - set to true for add to bookmarks
  • outlineText (optional) - set custom bookmark text, otherwise text from node
  • outlineExpanded (optional) - set to true for expanded/opened bookmark
  • outlineParentId (optional) - parent bookmark id
• Added property outlines for ToC, which adds all items to outlines / bookmarks (any existing outline settings on texts are respected)