Define an intermediate superclass for Transitions with a duration property

[Carl Carlec]

Hello JavaFX community,
I've created a draft PR for an enhancement to Transitions: https://github.com/openjdk/jfx/pull/1061
JavaFX contains many different Transitions that have a durationProperty() and related getter/setter.
Those transitions benefit from an abstract super class which defines this once. 
This will therefore reduce a lot of code duplications or big switch-cases to handle all Transitions like the one linked in the ticket.
 
I propose to create a new abstract class called TimedTransition, which extends from Transition and defines the durationProperty() + getter/setter. All Transitions which define a durationProperty() will now extend from it and do not need to define it.
Those Transitions are affected: FadeTransition, FillTransition, PathTransition, PauseTransition, RotateTransition, ScaleTransition, StrokeTransition, TranslateTransition.
 
Feedback welcome!
 
Carl
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