Redaction: Handle multiple Writer pages

* 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>

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