cli (call): Add no_ui output:

`no_ui` output is used when a local UI must not be created, e.g.; because the stream is
piped out. The `--no-ui` option has been removed because using a dedicated output seems
like a better approach.

libervia/cli/call_simple.py

@@ -175,6 +175,5 @@ class AVCallUI(BaseAVTUI):
             on_call_ended_cb=lambda sid, profile: parent.host.a_quit(),
             **kwargs,
         )
-        if not parent.args.no_ui:
-            ui = cls(parent.host, webrtc_call.webrtc)
-            await ui.start()
+        ui = cls(parent.host, webrtc_call.webrtc)
+        await ui.start()