[Pharo-project] Aaah, the pain or ParagraphEditor refactoring ;-)

Hi all, while further battling full unicode support I ended up refactoring ParagraphEditor to the extend that there a no references to the inst var sensor left. There are still a few references to the global Sensor though. With moving the model inst var down we could now basically get rid of class Controller :-) Class KeyboardBuffer is gone already. All that needs to be done is moving the utility methods in ScreenController to e.g. Display so we can remove that subclass of Controller as well. Volunteers? Michael