* Linkify links in HTML too:
- Creates a `ClickableLinkText` for `String`.
- Adds a `linkify` parameter to the original function, which is `true` by default.
- Does the linkify logic inside that component, if `linkify` is true.
* Add changelog
* Make sure we don't linkify user mentions or room aliases.
* Use remember to avoid re-processing the text for no reason.
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