xlsx support

[andiwand]

using ooxml #112 and DrawingML #97

functional

• meta
  • sheet count / names
• translation
  • all in one
  • partial
• edit
  • text
  • formula

visual

• empty rows / cells
  • quick hack
• spanned
• font
  • size
  • italic, bold
  • alignment
  • underline, strike through
  • color
  • family
• images
• drawings
• transform (e.g. flip, rotate)
• graphs / plots
• annotations

references

• http://officeopenxml.com/anatomyofOOXML-xlsx.php
• https://github.com/SheetJS/sheetjs

previous work

• xlsx styling #99

notes

• shared string styling is the same as in docx (WordprocessingML) http://officeopenxml.com/SSstyles.php
• links are not marked as links, as far as i can tell with limited visibility. handle with js?
• images are embedded in drawings
• dimension tag is optional or could be malformed (e.g. https://stackoverflow.com/questions/7204217/poi-creates-xlsx-files-incompletely-or-wronglythe-dimension-tag-in-the-xlsx-xml or worksheet xml dimensions awalker89/openxlsx#192)

[TomTasche]

Won't load file called "Ordnerruecken.xlsx", shared on 15.8. @andiwand