[w3c/pointerlock] movementX/Y coordinate space (#42)

The spec define movementX/Y from screenX/Y. However, while all major browser (except Edge) having screenX/Y in DIP(w3c/uievents#150), movementX/Y implementation are kind of mess here:

movementX/Y | Edge | Chrome | Firefox | Safari
-- | -- | -- | -- | --
coordinate space | Physical pixel | Physical pixel | CSS pixel | DIP(buggy?)
Scaled by device-scale-factor(OS High DPI setting) | X | X | ✓ | ✓
Scaled by page zoom | X | X | ✓ | X
Scale by Pinch-zoom | X | X | X | X

It would be nicer and clearer to have better interoperability. 
WDYT? @NavidZ @mustaqahmed @smaug----  

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