[Pharo-dev] EventHandler cleanup: test / review needed

Hi, There is still EventHandler, MouseOverEventHandler and MorphicEventHandler. After these two we can remove EventHandler and MouseOverEventHandler: https://pharo.fogbugz.com/f/cases/14403/never-use-EventHandler-but-MorphicEv... https://pharo.fogbugz.com/f/cases/14404/extend-MorphicEventHandler-with-mous... Can someone check if how this was done is Ok? Marcus