Tap to change slider position

[dinumihnea]

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Motivation

Based on guidelines for some popular design sistems the tap-to-change functionality is an important feature of a slider:

• Material Design Slider specs
• Microsoft's Fluent Design Slider
• Adobe React Spectrum Slider

Approach

In order to add the tap-to-change functionality I used the onTouchEnd View event. Not sure how suitable this event is, I couldn't find any downsides of not using it. Let me know if you think there's a better event to be used.

Fixes #115