Re: [w3c/pointerlock] movementX/Y to be double instead of long (#24)

As @smaug---- mentioned above, changing the webidl types to fractional is the first step anyway, and then we can do [what we did before](https://github.com/w3c/pointerevents/issues/107#issuecomment-232939986):
- PointerEvent's movement coordinates will be fractional, and
- MouseEvent's movement coordinates will be rounded to integers, and we drop the rounding here later on if the compat risk is low.

@EiraGe has agreed to look into this.

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