Aiortc

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Provide binary wheels for Linux, Mac and Windows on PyPI.

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Data channels
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* Add :attr:`RTCSctpTransport.maxChannels` property.
* Recycle stream IDs (256).
* Correctly close data channel when SCTP is not established (300).

Media
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* Add add :attr:`RTCRtpReceiver.track` property (298).
* Fix a crash in `AimdRateControl` (295).

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DTLS
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* Drop support for OpenSSL < 1.0.2.

Examples
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* `apprtc` fix handling of empty "candidate" message.

Media
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* Fix a MediaPlayer crash when stopping one track of a multi-track file (237, 274).
* Fix a MediaPlayer error when stopping a track while waiting for the next frame.
* Make `RTCRtpSender` resilient to exceptions raised by media stream tracks (283).

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Media
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* Do not repeatedly send key frames after receiving a PLI.

SDP
...

* Do not try to determine track ID if there is no Msid.
* Accept a star in rtcp-fb attributes.

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Peer connection
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* Assign DTLS role based on the SDP negotiation, not the resolved ICE role.
* When the peer is ICE lite, adopt the ICE controlling role, and do not use
agressive nomination.
* Do not close transport on `setRemoteDescription` if media and data are
bundled.
* Set RemoteStreamTrack.id based on the Msid.

Media
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* Support alsa hardware output in MediaRecorder.

SDP
...

* Add support for the `ice-lite` attribute.
* Add support for receiving session-level `ice-ufrag`, `ice-pwd` and `setup`
attributes.

Miscellaneous
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* Switch from `attrs` to standard Python `dataclasses`.
* Use PEP-526 style variable annotations instead of comments.

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* Drop support for Python 3.5.
* Drop dependency on PyOpenSSL.
* Use PyAV >= 7.0.0.
* Add partial type hints.