&mut A
Box<A>
Stable rustfmt lacks a lot of features resulting in worse formatted code, thus use nightly formatter.
[foo][bar]
[foo](bar)
ApplicationHandler
Add a simple `ApplicationHandler` trait since winit is moving towards trait based API. Add `run_app` group of APIs to accept `&mut impl ApplicationHandler` deprecating the old `run` APIs. Part-of: https://github.com/rust-windowing/winit/issues/3432
