Pydantic models are used more and more in Libervia, for the bridge API, and also to
convert `domish.Element` to internal representation.
Type hints have also been added in many places.
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- Former bookmarks implementation is now labeled as "legacy".
- XEP-0402 is now used for bookmarks when relevant namespaces are found, and it fallbacks
to legacy XEP-0048/XEP-0049 bookmarks otherwise.
- CLI legacy bookmark commands have been moved to `bookmarks legacy`
- CLI bookmarks commands now use the new XEP-0402 (with fallback to legacy one
automatically used if necessary).
A/V conference now adds user metadata about the stream it is forwarding through XEP-0298.
This is parsed and added to metadata during confirmation on client side.
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