Galene-stream

- Announce support for Galene protocol 2 (thanks jech, https://github.com/erdnaxe/galene-stream/pull/14).
- Add future plans in README.

Video stream is still dropping as https://github.com/erdnaxe/galene-stream/issues/3 is still an issue.

* Add a new `version` field in the handshake message (for Galene 0.6.0+).
* Ignore chathistory events (no more warnings on join).
* Add `galene-stream.py` entrypoint to the root of this repository to run the gateway without having to install the Python module.

Video stream is still dropping as https://github.com/erdnaxe/galene-stream/issues/3 is still an issue.

This version adds support for Galene 0.4 and drops support for Galene 0.3, https://github.com/erdnaxe/galene-stream/issues/5.
This version adds support for Python 3.10, https://github.com/erdnaxe/galene-stream/issues/10.

Video stream is still dropping as https://github.com/erdnaxe/galene-stream/issues/3 is still an issue.

* Fix compatibility with `gstreamer-vaapi` decoders.
* Activate NACK and PLI to recover from network drops.
* Add `--bitrate` command line option.
* Add `!webrtc` chat command to print gateway statistics.

We still have drops due to Galène not implementing retransmission on a separate track (https://tools.ietf.org/html/rfc4588).

This is the last release supporting Galène 0.3.x. For Galène >=0.4, please use a more recent version (https://github.com/erdnaxe/galene-stream/issues/5).

* Tweaks to improve GStreamer pipeline performance and quality on GStreamer 1.18+
* Fix warning when no TURN servers are announced
* Add Vagrantfiles to test project on Ubuntu, Debian and ArchLinux.

Galène stream should now be usable to stream OBS to Galène. If you encounter any issue, please report.

* Rename project to galene-stream.
* Add support for SRT and file streaming.
* Add entrypoint to execute main script.

There is still issues with GStreamer performances.