* Implemented threadsafe platform channel replies on windows
* added unit test
* added docstrings
* implemented glfw
* added comments
* made glfw messenger unable to be copied
* stuart feedback 1
* stuart feedback 2: replaced the shared_ptr
* stuart feedback 3
* stuart feedback: remove error log
* Moved FlutterDesktopMessenger to its own file.
* updated licenses
* stuart feedback
Adds a new header, flutter_macros.h which includes a FLUTTER_DEPRECATED
macro that can be used to mark deprecated API as such, with a
hopefully-informative message, ideally describing the expected removal
version and any migration tips.
This will need to be #included in flutter_windows.h and flutter_linux.h,
but prior to doing so, we'll need to update the engine recipe to bundle
the new header, here:
https://flutter.googlesource.com/recipes/+/refs/heads/main/recipes/engine/engine.py#1457
No tests since this adds a compiler macro that will be used for future
C/C++ API deprecation once the above recipe change has landed;
specifically: FlutterDesktopEngineProcessMessages.
Related: https://github.com/flutter/flutter/issues/93537
Fixes a minor whitespace inconsistency on the documentation for
FLUTTER_EXPORT.
No test change since there is no change to code semantics.
Related: https://github.com/flutter/flutter/issues/93537
