backend, frontend: prepare remote control: 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. rel 436

--- a/libervia/cli/call_gui.py	Sat May 11 13:25:45 2024 +0200
+++ b/libervia/cli/call_gui.py	Sat May 11 13:52:41 2024 +0200
@@ -216,8 +216,7 @@
             parent.host.bridge,
             parent.profile,
             call_data,
-            sinks=webrtc.SINKS_APP,
-            appsink_data=webrtc.AppSinkData(
+            sinks_data=webrtc.SinksApp(
                 local_video_cb=partial(av_call_gui.on_new_sample, video_stream="local"),
                 remote_video_cb=partial(av_call_gui.on_new_sample, video_stream="remote"),
             ),