Split xcu files for Z compressable graphic formats. This introduces a
new option for exporting each Z compressed graphic format without
needing to check for extension.
Change type detection accordingly in graphicfilter.
Change-Id: Iabb971123f5e394196716900796632cb8ed12ece
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/135181
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
offtkp
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