Lossless optimization of png image files, using `pngslim` and other tools.
Program graphics (compiled or included with software):
- Slimmed 1.8 KiB (~1.5 KiB kpacked), average ~20% saving for 10 files.
git-svn-id: svn://kolibrios.org@10036 a494cfbc-eb01-0410-851d-a64ba20cac60
