[w3c/screen-orientation] Standardize window.orientation API (PR #271)

- Add Window interface extension with orientation attribute and onorientationchange handler
- Integrate orientationchange event firing into existing screen orientation change steps
- Map window.orientation values according to WHATWG compat spec algorithm
- Support required values (-90, 0, 90) and optional 180° value
- Remove device-specific restrictions to support device-independent web

This moves window.orientation from WHATWG compat spec to Screen Orientation spec where it belongs conceptually, providing a single authoritative definition.

Fixes #249

The following tasks have been completed:

 * [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/enter_bug.cgi)
 * [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/screen-orientation/pull/271

-- Commit Summary --

  * Standardize window.orientation API

-- File Changes --

    M index.html (52)

-- Patch Links --

https://github.com/w3c/screen-orientation/pull/271.patch
https://github.com/w3c/screen-orientation/pull/271.diff

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