* Receive: Config of decode sample rate/channels
This PR allows for dynamic configuration of the output sample rate and
channel count of received Opus audio. Users who rely on supported
formats should no longer need to manually resample & downmix audio
decoded from SSRCs in a call.
Opus exposes tuples of (Mono, Stereo) x (8, 12, 16, 24, 48)kHz.
Changing this at runtime (mid-call) may cause some audio glitches, as
decoder state must be reconstructed from scratch for all affected SSRCs.
* Fix doc typo, consistent naming with MixMode.
This PR Introduces a new `VoiceTick` event which collects and reorders all RTP packets to smooth over network instability, as well as to synchronise user audio streams. Raw packet events have been moved to `RtpPacket`, while `SpeakingUpdate`s have been removed as they can be easily computed using the `silent`/`speaking` audio maps included in each event.
Closes#146.
This PR makes many of the types under `EventContext` separate `#[non_exhaustive]` structs. This makes it more feasible to add further information to connection and packet events as required in future. On this note, driver (re)connection events now include the SSRC supplied by Discord and the domain name which was connected to.
In addition, this fixes global timed events to return a list of all live tracks, and extensively details/documents events at a high level.
This was tested using `cargo make ready`.
