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This makes two changes: - Adds a way to register a callback for when a FlutterDesktopPluginRegistrarRef is destroyed, and implements the logic to call it in the Windows and Linux embeddings. - Adds a class to the C++ wrapper that handles making a singleton owning PluginRegistrar wrappers, and destroying them when the underlying reference goes away, to avoid needing that boilerplate code in every plugin's source. Fixes https://github.com/flutter/flutter/issues/53496
This code is intended to be built into plugins and applications to provide higher-level, C++ abstractions for interacting with the Flutter library. Over time, the goal is to move more of this code into the library in a way that provides a usable ABI (e.g., does not use standard library in the interfaces). Note that this wrapper is still in early stages. Expect significant churn in both the APIs and the structure of the wrapper (e.g., the exact set of files that need to be built).