[w3c/uievents] Needs alternative WheelEvent.deltaMode, WheelEvent.delat(X|Y|Z) (#181)

Currently, unit of WheelEvent.delta(X|Y|Z) value is defined by WheelEvent.deltaMode in UI Events. However, Chrome and Edge almost always fire wheel events with WheelEvent.DOM_DELTA_PIXEL. Therefore, a lot of web sites are broken on Gecko which only fires wheel events with native event's units.

So, for backward compatibility, WheelEvent.deltaMode should return always WheelEvent.DOM_DELTA_PIXEL, unfortunately. However, some better web application developers may want raw delta(X|Y|Z) values as far as possible.

Therefore, I'd like to propose that UI Events should declare that WheelEvent.delatMode always return WheelEvent.DOM_DELTA_PIXEL and WheelEvent.delta(X|Y|Z) are delta values in pixels.  Additionally, there should be alternative attributes which are set raw event information. E.g., WheelEvent.rawDelta(Mode|X|Y|Z).

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