[w3c/pointerlock] Option needed to disable OS-level adjustment for mouse acceleration (#36)

Some games need to disable mouse acceleration to achieve a better gaming experience ([1](https://us.battle.net/forums/en/overwatch/topic/20753608843), [2](https://www.reddit.com/r/GlobalOffensive/comments/2qv4q8/why_is_mouse_acceleration_bad_for_gaming/)).

I believe this best fits in the pointerlock request api as an option to provide such a capability. [Here](https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-systemparametersinfoa) is the Windows API allowing to disable that.

@smaug---- @eirage WDYT?

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