A new option AddReplacementImages was added to prevent
addition of fallback images that could increase the file
size of the package in several times.

Added unit test.

Change-Id: I50eebba51072d3c93bfe6bed59e9f007568810c0
Reviewed-on: https://gerrit.libreoffice.org/51939Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>