MinoPropertyBeat: overload setLabel() to set internal MCL
MinoPropertyBeat: can now be constructed using reversed order items (used for beat duration)
MinaExpandingObjects: remove unused functions
MinaExpandingObjects: use MinoPropertyBeat instead MinoItemizedProperty for beat duration
MinaFallingObjects: use MinoPropertyBeat instead MinoItemizedProperty for beat duration
MinaRandomPixels: use MinoPropertyBeat instead MinoItemizedProperty for beat duration
MinaStars: use MinoPropertyBeat instead MinoItemizedProperty for beat duration
MinaText: use MinoPropertyBeat instead MinoItemizedProperty for beat duration