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

> Based on some feedback, implementing this properly on all the platforms can be tricky. Linux for example has several ways to control acceleration. And I'm not sure even about MacOS.

@smaug---- Chrome implements the option on Windows, macOS, and Chrome OS. On Windows and macOS we don't need to modify any system-wide settings.

**Windows**: Use the [Raw Input](https://docs.microsoft.com/en-us/windows/win32/inputdev/raw-input) API to receive WM_INPUT notifications. [RAWMOUSE](https://docs.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-rawmouse) contains linear unaccelerated pointer data.

**macOS**: Read CGEvent's kCGEventUnacceleratedPointerMovementX and kCGEventUnacceleratedPointerMovementY fields which are populated on 10.14+ but only declared in the SDK starting from 10.15.1.

No solution for Linux yet.

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