cli: call command:

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.

rel 426

pyproject.toml

@@ -47,6 +47,7 @@ dependencies = [
     # "python-potr < 1.1",
     "pyxdg < 0.30",
     "pyyaml < 7.0.0",
+    "prompt_toolkit ~= 3.0",
     "rich ~= 13.5",
     "sat_tmp @ hg+https://repos.goffi.org/sat_tmp#egg=sat_tmp",
     "setuptools_scm",