airplay2-receiver

# Experimental

Somewhat comprehensive python implementation of AP2 receiver using **some
multi-room** features. For now it implements:

- HomeKit transient pairing (SRP/Curve25519/ChaCha20-Poly1305) - bit flag 48
- HomeKit non-transient pairing
- Some refinements for HomeKit interaction (e.g. managed/active flags)
- Persist device name and some HomeKit properties across restarts (just use the -m flag again to set the device name anew)
- FairPlay (v3) authentication and decryption of AES keys - the first and only Python implementation. Credit to @systemcrash for implementation.
- Receiving of both REALTIME and BUFFERED Airplay2 audio streams
- Airplay2 Service publication
- Decoding of all Airplay2 supported CODECs: ALAC, AAC, OPUS, PCM.
 Ref: [here](https://emanuelecozzi.net/docs/airplay2/audio/) and 
      [here](https://emanuelecozzi.net/docs/airplay2/rtsp/#setup)
- Output latency compensation for sync with other Airplay receivers
- ANNOUNCE and RSA AES for unbuffered streaming from