* remove ffmpeg from stream to use opus and vpx, add bunch of todos
* fix testing
* improve download checkout
* fix datachannel download, fix super dirty test clients - setup logic does not belong there
* fix testing
* api: add WebSocket /ping endpoint and update session guard to support WebSocket subprotocol auth; add tests (test_api_ping.py)
* Initial websocket support using ping
* Initial websocket support using ping
* Initial websocket support using ping
* Combine imports