I'm preparing to get rid of our application delegate in favour of registering
notification observers, to do so I'm renaming `app_delegate.rs` to
`app_state.rs`, and moving the functionality out of the Objective-C method
into a normal method.
Additionally, `AppState` previously implemented `Default`, but really, this
was a hack done because someone (probably myself) was too lazy to write out
the full initialization in `AppDelegate::new`.
Tracing is a modern replacement for the log crate that allows for
annotating log messages with the function that they come from.
Signed-off-by: John Nunley <dev@notgull.net>
Closes: #3482
This makes our use of `unsafe` to make the event handler temporarily 'static be local to a module, in a way that's (hopefully) much easier to reason about.
