[TASK] Add Illustrator files into Build folder

After some discussions we decided to add also the "source" files for
assets into the CMS git repository.

Resolves: #68216
Releases: master
Change-Id: Ibe62eba610f9c10abf6819cacb588c05bc855dae
Reviewed-on: http://review.typo3.org/41455


Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>