* issues
* todo
-** level basketball
+** unstable physics computations
+** menu: (two rows)
** level domino + box + basketball
** level teetertooter
** level domino + box + basketball + teetertooter
** intro animation (from target item to start position)
+** optimize images creation (python setup.py images)
** use dds files in place of png/jpg
** use bam files
** refactoring