[w3c/pointerlock] feature request : Allow to set pointer position upon release (#61)

Hi,

Here at Philips we develop a medical imaging application that uses requestPointerLock extensively to allow for complex Mouse+keyboard operations on canvas.
Specifically, the user may perform really long drags (for example for zooming) , which without the pointerlock would exit the canvas.
We have a problem when the operation needs to be communicated via the pointer as well as the change in the image, for example in tools like ‘magnify glass’ tool - When the user releases the mouse, the cursor goes back to its initial location, and the user may have a long way to move the mouse to the new position of the magnify glass

I know this has been discussed a little in #41, but the scenario is different.

we suggest adding two optional arguments to exitPointerLock: a dx and dy to set the pointer to a new position just before making the pointer visible.

````
document.exitPointerLock(dx, dy);
````

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