Re: [touch-events] TouchEvent should have a constructor (#10)

I'd like to do this because otherwise there's no way to create a TouchEvent with any new fields in UIEvent (such as [sourceDevice](rbyers.github.io/InputDevice/inputdevice.html)), or any of the new extension values (radius, etc.).

In fact, I suspect there's so little usage of createTouch/createTouchList/initTouchEvent that we will be able to remove them completely once there is a constructor (collecting usage stats in chromium now).

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