``call`` commands now handle various output. Beside the original one (now named
``simple``), a new ``gui`` one display a full featured GUI (make with Qt).
PyQt 6 or more needs to be installed.
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`init_script_path` option can be used in `[DEFAULTS]` to run a script at the end of
backend initialisation. A new `init_pre_script` method is used to wait for backend to
reach this stage (designed to be used mostly by CLI frontend), then the usual `ready_get`
method is finished once the script is finished.
the plugin was using python-dbus which is deprecated in the backend in the favor of
TxDBus. Methods calls have been updated, and the plugin works again, but there seems to be
still some issues (warnings in the logs). Those will be fixed later.
This command has 2 subcommands: `make` and `receive` to make a new call or wait for one.
When call is in progress, a window will be created to show incoming stream and local
feedback, and a text UI is available to (un)mute audio or video, and hang up.
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it may be necessary to run some async cleaning method (e.g. if bridge is needed), this new
method handles async cleaning method, and will be called when `SystemExit` is used, or if
`a_quit` is called explicitely.
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