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`.
Songbird examples
These examples show more advanced use of Songbird, or how to include Songbird in bots built on other libraries, such as twilight or serenity.