- OsError now implements exception, remove workaround.
- Prefer is check to catching TypeError

Treats 'pluginClass: none' as equivalent to having no 'pluginClass'
entry on the desktop platforms, to satisy stable channel plugin
validation of Dart-only desktop plugin implementations. See
issue for full details.

Part of https://github.com/flutter/flutter/issues/57497

* Bump flutter_gallery_assets version to ^0.2.0.

* Run `flutter update-packages --force-upgrade`.

* Add comment.

* Remove duplicate key.

To simplify development of the in-progress GTK embedding, which will
replace the GLFW embedding on Linux, add the GTK artifacts to the unpack
list. This means that until the transition, both the GLFW and GTK
artifacts will be unpacked.

Part of #54860

The -S/-B format of specifying source and build directories wasn't added
until 3.13. For 3.10 compatibility, use the older form of having the
working directory as the build directory, and the last argument as the
source directory.

Fixes #57409

Throw a toolExit if the windows plugin logic runs on an invalid windows project. Update the supported project check to validate the existence of a Runner.sln file

Updates the Linux templates to use CMake+ninja, rather than Make, and updates the tooling to generate CMake support files rather than Make support files, and to drive the build using cmake and ninja.

Also updates doctor to check for cmake and ninja in place of make.

Note: While we could use CMake+Make rather than CMake+ninja, in testing ninja handled the tool_backend.sh call much better, calling it only once rather than once per dependent target. While it does add another dependency that people are less likely to already have, it's widely available in package managers, as well as being available as a direct download. Longer term, we could potentially switch from ninja to Make if it's an issue.

Fixes #52751

This reverts commit 8de07d55.

* Uses a special cursor value MouseCursor.defer to mark deferring. MouseTrackerAnnotation.cursor is now non-null. The mouseCursor argument of widgets or render objects can be null, which indicates using the default value.
* Moves SystemMouseCursors.uncontrolled to MouseCursor.uncontrolled.
* Changes how MouseCursor.debugDescription is defined. Previously MouseCursor.toString returns $runtimeType($debugDescription), while now it returns $debugDescription. Implementations of classes are updated, except for the ones of MouseCursor.defer and MouseCursor.uncontrolled are simply "defer" and "uncontrolled".

* 9e3e3ba68 [web] Represent CSS identity transforms as 'none' instead of null (flutter/engine#18288)

* 80fa77eb3 Roll src/third_party/skia 3ebadcc98eab..056d543c91e0 (8 commits) (flutter/engine#18344)

* 480d8e458 Fix scenario platform view tests on Android (flutter/engine#18332)

* 03856642d Roll src/third_party/dart d6fed1f62444..29c00e28f350 (16 commits) (flutter/engine#18347)

* 8371b44e5 Roll src/third_party/skia 056d543c91e0..71903997254f (7 commits) (flutter/engine#18350)

* f321613e5 Add guards on FlValue methods to check for NULL values (flutter/engine#18226)

* dc93db5ab Move FlutterLoader disk I/O to a background thread to comply with Android strict mode (flutter/engine#18241)

* bf1287c12 null-annotate lerp.dart, annotations.dart, channel_buffers.dart, hash_codes.dart (flutter/engine#18348)

* 960035462 Add FlBasicMessageChannel (flutter/engine#18189)

* df2dface3 Roll src/third_party/skia 71903997254f..6c3db04c8b03 (9 commits) (flutter/engine#18361)

* 5ad4f9ee4 Add FlJsonMessageCodec (flutter/engine#18221)

* 84ea89262 Roll src/third_party/skia 6c3db04c8b03..7156db260239 (4 commits) (flutter/engine#18370)

* f848069d4 Roll src/third_party/dart 29c00e28f350..f99631b12c4a (29 commits) (flutter/engine#18373)

* c791ce9b1 Roll src/fuchsia/sdk/mac from gOhJW... to Vepm4... (flutter/engine#18377)

* 5b62a6351 Roll src/third_party/dart f99631b12c4a..e0257265d34e (2 commits) (flutter/engine#18378)

* 0b4100946 Roll src/third_party/skia 7156db260239..5b2ede3d0d44 (8 commits) (flutter/engine#18380)

* 08b61ce56 Delete unused decode UTF-8, JSON functions (flutter/engine#18360)

* 73d835cbd Roll src/third_party/dart e0257265d34e..2676764792b2 (4 commits) (flutter/engine#18383)

* 9e166fbf4 Roll src/third_party/skia 5b2ede3d0d44..39ec60aa8348 (5 commits) (flutter/engine#18384)

* 2cdbc7f92 Remove pipeline in favor of layer tree holder (flutter/engine#18285)

* 47513a70e Roll src/third_party/skia 39ec60aa8348..79c5674a4ca1 (3 commits) (flutter/engine#18389)