Except for jpeg and png, most natively-stored image fileformats compress
rather well with zlib. adding a number of vector and pixel formats.

Change-Id: I97407a98f620520b0d11552911d2339bf004dc5b
Reviewed-on: https://gerrit.libreoffice.org/20461Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>