refactor: migrate to `dpi` crate (#1202)

* refactor: migrate to `dpi` crate

closes #1172

* macOS

* linux

* fix doctests

* imports

* more doctests

* fix android and ios

* Update examples/winit.rs

Co-authored-by: Jason Tsai <jason@pews.dev>

* Update src/webview2/mod.rs

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Co-authored-by: Jason Tsai <jason@pews.dev>