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/frontends/tools/webrtc_file.py	Sat May 11 13:25:45 2024 +0200
+++ b/libervia/frontends/tools/webrtc_file.py	Sat May 11 13:52:41 2024 +0200
@@ -147,13 +147,14 @@
             self.bridge,
             self.profile,
             call_data,
-            sources=webrtc.SOURCES_DATACHANNEL,
+            sources_data=webrtc.SourcesDataChannel(
+                dc_open_cb=partial(self._on_dc_open, file_path)
+            ),
             call_start_cb=partial(
                 self._on_webrtc_call_start,
                 file_path,
                 file_name,
             ),
-            dc_open_cb=partial(self._on_dc_open, file_path),
         )
 
 
@@ -295,6 +296,7 @@
             self.bridge,
             self.profile,
             call_data,
-            sinks=webrtc.SINKS_DATACHANNEL,
-            dc_on_data_channel=self._on_data_channel,
+            sinks_data=webrtc.SinksDataChannel(
+                dc_on_data_channel=self._on_data_channel,
+            ),
         )