[css-text-4] auto-phrase (#9242)

* [css-text-4] auto-phrase

Recast word-boundary-detection:auto() as word-break:auto-phrase,
as well as word-boundary-detection:manual as word-break:manual.

This allows retiring the word-boundary-detection property.

Also, the word-boundary-expansion property needed to gain its own
auto-phrase value, since it could no longer depend on
word-boundary-detection:auto().

Supporting sections had to be reorganized as well to keep the whole
thing coherent.

See #7193.

Co-authored-by: fantasai <fantasai.bugs@inkedblade.net>

* [css-text-4] Rename word-boundary-expansion to word-space-transform

Since there's no longer a pair of word-boundary-* properties, there's no
need to keep the two names related, and the original name was quite a
mouthful. 'word-space-transform' is simpler, and better show-cases the
similarities with text-transform.

Part of #7193

Co-authored-by: fantasai <fantasai.bugs@inkedblade.net>

* [css-text-4] Preserve old id in markup

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Co-authored-by: fantasai <fantasai.bugs@inkedblade.net>

Author: frivoal