more transition away from polling and toward events/gestures.  First 22 levels don't use polling
level 23 has multiple draggable obstacles
done transitioning to gestures through level 38, though a refactor will be needed after the transition is done
down to 4 levels requiring updates, and then we'll need to do some cleanup/refactoring
done converting everything to gestures... time to clean up
some cleanup and refactoring