ExactCalculator: Add haptic image button widget
This is a basic extension of ImageButton that provides haptic feedback when the user touches the button (*not* when they release, to reduce latency). It uses the system's predefined virtual key haptic feedback effect for modern vibration effects that the user is already familiar with and automatic response to changes in system vibration settings. Change-Id: Ib390860809438b9289364c8a2ece2528853bb338
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