macOS target beeps on every keystroke

[DavidPhillipOster]

Consider adding to ClockScene.swift:

    /// without this, it beeps on every keystroke, recognized or not.
    override func keyDown(with event: NSEvent) {
      if let character = event.characters {
        switch character {
        case "c","o","p","q","r","t","w":
          break
        default:
          super.keyDown(with: event)
        }
      }
    }

[amiantos]

Hah! Thanks, I think I had my speakers off the whole time I was working on this so I never heard the beeping during dev.