add keyhandlers to zeus interface, fix #33

[commy2]

fixes: #33

• current display (Converted tabs to spaces #46 or Move addMissionEventHandler to postInit #312) is passed to the custom keyDown script as params ["_display"];
• also adds "CBA_curatorOpened" and "CBA_curatorClosed" events which probably could be usefull in other places or for mission makers