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Introduce RouletteTapWrapper
Introduce RouletteTapWrapper.
Introduce the RouletteTapWrapper helper for responding user tap.
!!!Disclaimer:
I'm not good at handling touch events, so this is not a fine-grained implementation, touch effect may not be very accuracy.
The proper way to implement this is add it to the RoulettePaint/_RoulettePainter class to make the painter Widget a implicit touchable Widget.
Closes #11