* Creates one GDIMetaFile from each Writer page
  * Inserts them as Shapes into the newly created Draw doc
  * Has some 'magic' numbers needs to be figured out
  * Tried with a 100-page Writer doc, seems okay
  * Seems slow, might need to be optimized
    * Seems like getDocumentSizeInPixels() and getDocumentSizeIn100mm()
      are consuming most of the cycles. Will look into this at the end.

Change-Id: Ie40cd64b69fad3e66d74b6b05600cb9f52f1021b
Reviewed-on: https://gerrit.libreoffice.org/65847
Tested-by: Jenkins
Reviewed-by: Muhammet Kara <muhammet.kara@collabora.com>