* format

* license script adaptions

* updated licenses

* review comments

* Fix remaining ftl->fxl conversions

The previous scripting pass at this did not account for objective c file endings

* Update tonic DEPS reference to the post-fxl version

This flag was set in the Blink renderer (see FontPlatformData::setupPaint)

* Various iOS a11y fixes

* undo

* review comments

* review comments

Fixes https://github.com/flutter/flutter/issues/12037

These were previously undetected because Wdelete-non-virtual-dtor
didn't work with std::unique_ptr, but that's no longer the case.

This is follow-up to https://github.com/dart-lang/sdk/commit/c7faf2dc6b64b65e04d677fa3ad68c1e90e19bff, which made Dart_LoadKernel responsible for the bytes.

* Roll Dart to 7b56ef96e2cc77150738366566357912c442ff5b
* Updated license

A node is considered focusable if it contains information that is interesing to the user. A node that doesn't add any semantic information of its own should not be focusable. It's expected that such a node has children, who have smeantics information and are therefore focusable.

Fixes https://github.com/flutter/flutter/issues/11179

Fixes https://github.com/flutter/flutter/issues/11952

Now it references dart:zircon and dart:fuchsia.

* Revert "Update buildroot to pull in clang_arm64 toolchain definitions. (#4065)"

This reverts commit dd4f1f29.

* Revert "Update paths for icu_data move (#4068)"

This reverts commit 9bde942a.

* Revert "Adapt semantics event handling to framework changes (#4066)"

This reverts commit ceb6d05c.

* Revert "Roll skia to afb0bd4. (#4064)"

This reverts commit befe2da6.

This change basically moves the singaling of the surface acquire event into the gpu driver, eliminating the VkQueueWaitIdle on surface submission

This change depends on https://skia-review.googlesource.com/c/25641/ so do not submit until Flutter has rolled Skia past that point

This only operates correctly when the application is killed using the
Kill() method. Flutter applications on Fuchsia currently don't have any
way to shut themselves down, see:
https://github.com/flutter/flutter/issues/11934

* Roll dart dep

* Roll dartdoc dep

* Update license hash, ignore changes to file list

* Use BinaryPrinter instead of KernelSerializer to accomodate IKG

* Close sink opened with openWrite