This also fixes macOS returning `None` in `Window::theme()` if no theme
override is set, instead it now returns the system theme.
MacOS and Wayland were the only ones working correctly according to the
documentation, which was an oversight. The documentation was "fixed"
now.
Fixes#3837.
This allows the user more control over how they pass their application state
to Winit, and will hopefully allow `Drop` implementations on the application
handler to work in the future on all platforms.
Move iOS and macOS implementations to a shared folder called `apple`, to allow
us to reduce the code-duplication between these platforms in the future.
The folder structure is now:
- `src/platform_impl/apple/`
- `appkit/`
- `uikit/`
- `example_shared_file.rs`
- `mod.rs`
* Add preliminary support for tvOS, watchOS and visionOS
* Reduce duplication in Cargo.toml when specifying dependencies
