37891 Focus debug

38651 Update the macOS Podfile template platform version

9654 Begin separating macOS engine from view controller

9672 Add FLEDartProject for macOS embedding

9745 Fix windows test by not attempting to open a directory as a file.

9799 Update buildroot to c4df4a7b to pull in MSVC 2017 Update 9 on Windows.

9835 [Windows] Alternative Windows shell platform implementation

9953 [macos] Add reply to binary messenger

10009 [macos] Revert check on FlutterCodecs and refactor message function]

10189 [macos] Reland function refactor

11010 Rename macOS FLE* classes to Flutter*