Re: [uievents] Expose 'direction-inversion' in wheel events (#57)

Interesting. Perhaps if it's indeterminate on the platform the property could simply be `undefined`. I think it's worth thinking about consistency from the perspective of a single person as well (whom we can usually assume is sitting in front of a single computer running a single operating system). If (for example) Mac apps behave in a certain way with regard to scroll events, I think it's reasonable to expect web pages on the same platform to behave in a similar way.

(Also, sounds like a good excuse for Windows to add that data to its mouse wheel messages, they seem to care a lot more about this recently with their precision touchpad work).

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