implement EventResult, global keyboard navigation
#775
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combine `ShapeBuildable` and `PenPathBuildable`
replacing `merge()`
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This PR refactors the Pens and Builders to return
EventResult's to communicate whether the event was handled and/or should be propagated further.If a event was not handled by the current
Pen, thePenHoldernow gets the chance to process it for global actions. CurrentlyNavLeft,NavRight,NavUpandNavDownkey presses are handled to move the view around.