Remove ControllerViewTrait which isn't used and move controllerMode from View to Element.
Remove ControllerViewTrait which isn't used and move controllerMode from View to Element.

foam-framework/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2