This is a series of changes necessary to prepare the implementation of remote control
feature:
- XEP-0166: add a `priority` attribute to `ApplicationData`: this is needed when several
applications are working in a same session, to know which one must be handled first.
Will be used to make Remote Control have precedence over Call content.
- XEP-0166: `_call_plugins` is now async and is not used with `DeferredList` anymore: the
benefit to have methods called in parallels is very low, and it cause a lot of trouble
as we can't predict order. Methods are now called sequentially so workflow can be
predicted.
- XEP-0167: fix `senders` XMPP attribute <=> SDP mapping
- XEP-0234: preflight acceptance key is now `pre-accepted` instead of `file-accepted`, so
the same key can be used with other jingle applications.
- XEP-0167, XEP-0343: move some method to XEP-0167
- XEP-0353: use new `priority` feature to call preflight methods of applications according
to it.
- frontend (webrtc): refactor the sources/sink handling with a more flexible mechanism
based on Pydantic models. It is now possible to have has many Data Channel as necessary,
to have them in addition to A/V streams, to specify manually GStreamer sources and
sinks, etc.
- frontend (webrtc): rework of the pipeline to reduce latency.
- frontend: new `portal_desktop` method. Screenshare portal handling has been moved there,
and RemoteDesktop portal has been added.
- frontend (webrtc): fix `extract_ufrag_pwd` method.
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- file send/receive commands now supports webRTC transfer. In `send` command, the
`--webrtc` flags is currenty used to activate it.
- WebRTC related code have been factorized and moved to `libervia.frontends.tools.webrtc*`
modules.
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- the `merge_pip` option is now used to indicate if local feedback and remote video
streams must be merged with local feedback being a PiP of remote video. By default, it's
done for `SINKS_AUTO`, but it can be manually specified to use it with `SINKS_APP` or to
split ``SINKS_AUTO`` in 2 windows.
- target size of the compositor used with `merge_pip` can be specified. By default, 720p
is used.
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- Freedesktop Desktop Screenshare port is now used when Wayland is detected (needs
`xdg-desktop-portal` with the implementation corresponding to desktop environment).
- Add a binding feature to feedback state to application (e.g. if desktop sharing is
cancelled from desktop environment, or at portal's permission request level).
- fix misnaming of video source (was wrongly named `camera` instead of `video`).
- fix desktop sharing pad selection in `input-selector` when it has been added once, then
removed, then added again.
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this is a factored implementation usable by all non-web frontends. Sources and Sinks can
be configured easily to use tests source or local webcam/microphone, autosinks or a
`appsink` that the frontend will use.
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