Packs used images in sorted order into theme .zip files
The essence of this module is contained within [[solenv/bin/packimages.pl]].
This script takes several sources of information:
* the list of images used in every .src file that is compiled
* the configuration XML describing every command that is used
* [[packimages/pack/iamge-sort.lst]] which provides a profile based
ordering of images.
It then tries to pack the images together into the .zip file into an
order that matches / is similar to that which we want at run-time, ie.
an entire toolbar's images should (ideally) be next to each other in a
nice linear run, to reduce LibreOffice's working set, and improve
startup performance: we require all these images to get paged in on
start.
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