Re: [uievents] Expose 'inertial scrolling state' in wheel events (#58)

Two bracketing events are really equivalent to two boolean bits on the event, eg. `isEnding` (for detecting the scrolling-inertia-end) and `isInertialScrolling` for detecting the `scrolling-inertia-begin`.  I think this mostly comes down to a matter of style.

I (from blink's perspective) have a bit of a preference for the latter because it's a smaller API and it avoids problems / unnecessary overhead in atomic wheel scrolling case (USB mouse wheel with no defined start/end).

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