MouseTracker - Pointer over/out event fixes

Fixes #152, #404, #420, #427
Can you try `this.element.style.touchAction` and `this.element.style.msTouchAction`? Then again, I’d recommend creating a helper function that auto-prefixes vendor specific CSS properties, e.g. https://github.com/peutetre/vendor-prefix.

Then again, if it works, maybe just leave it and sorry for the intrusion :wink: