Improve performance of Emoji tests and loading of the polyfill.
Reduces the number of tests to determine browser support for emoji to those most likely to fail. Adds the defer flag to the loaded scripts for browsers lacking support.
Props superpoincare for perf testing, peterwilsoncc.
Fixes#37817.
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[38179] added support for the rainbow flag to core, but platform compatibility is a bit strange, because the flag was defined out of sync with the usual Unicode release cycle. For example Android N supports all Unicode 9.0 emoji, but doesn't support the rainbow flag thus the rainbow flag isn't rendered.
The Twemoji loader already has an exception for flags - it'll load if the browser supports everything but flags, and then only replace flag emoji, leaving everything else as native rendering. To provide a seamless experience for all flags the loader now uses the rainbow flag to test flag support.
Props pento.
See #37543.
Fixes#37566.
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This includes a new test in the emoji loader, to see if the browser supports rendering Unicode 9.0 emoji, as well as an update to `twemoji.js`, to load Unicode 9.0 twemoji images.
The default CDN location for loading Twemoji images has changed, moving to a versioned subdirectory. This allows updates without needing to purge the CDN.
Fixes#37361.
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[37028] missed some logic to capture the base emoji skin tone, to compare to the modified emoji skin tone. This caused all browsers to report that they supported skin tone modifiers, regardless of whether they actually did.
Fixes#36604 for trunk.
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When the browser test for diversity emoji was added in [36160], it included a workaround for Chrome not being able to compare `Uint8ClampedArray` objects directly, by converting them to a string. Unfortunately, Safari doesn't support the `Uint8ClampedArray.toString()` method correctly, so the test was incorrectly failing in Safari.
Fixes#36266 for trunk.
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As new sets of emoji are added to Unicode, and browsers add support for them at random intervals, we'll inevitably need to add new tests to the emoji loader. This change makes it much easier to add new tests as they're needed.
Fixes#35300.
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