* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs

Analyzer warning.

Fixes various Flutter framework test failures when bytecode is enabled.

Bytecode generation will otherwise omit assert code, causing --enable-asserts to have no effect in the VM.

This reverts commit 202c1b42.

* Switch iOS gen_snapshot from multi-arch binary to multiple binaries

* Make snapshotterPath mutable

This reverts commit 58092195.

* Remove multi-arch check in iOS builds

* Manual roll of https://github.com/flutter/engine/pull/10010

Slight cleanup of file locations in flutter_tools
to make it easier to see which files are responsible
for data reporting.

* more ui-as-code

* address review comments

Android now exclusively uses ELF shared libraries, and
iOS uses assembly.

AOT compiled code is now packaged as an ELF library for Android targets.
By default gen_snapshot's output contains debug symbols.  The symbols could
be stripped as a separate step, but that requires NDK tools that the user
may not have available.

This change passes a gen_snapshot flag that omits the symbols, and it filters
out a warning printed when that flag is used.

* Gradle generates ELF shared libraries instead of AOT snapshots.
* `flutter build apk/appbundle` supports multiple `--target-platform` and defaults to `android-arm` and `android-arm64`.
* `flutter build apk` now has a flag called `--split-per-abi`.

Revert "Generate ELF shared libraries and allow multi-abi libs in APKs and App bundles (#33696)" (#34121)

* Gradle generates ELF shared libraries instead of AOT snapshots.
* `flutter build apk/appbundle` supports multiple `--target-platform` and defaults to `android-arm` and `android-arm64`.
*  `flutter build apk` now has a flag called `--split-per-abi`.

Use Dart's new direct ELF generator to package AOT blobs as shared libraries in Android APKs (#33611)

This is a replacement for the old implementation of --build-shared-library
that emits an AOT assembly snapshot and feeds it to the Android NDK toolchain.

Splits Xcode validation out of the iOS validator and into a stand-alone
validator, and groups the CocoaPods validator with that top-level
validator instead of the iOS validator. iOS now validates only the
iOS-specific tools (e.g., ideviceinstaller).

Reorganizes many of the associated clases so that those that are used by
both macOS and iOS live in macos/ rather than ios/. Moves some
validators to their own files as part of the restructuring.

This is the macOS portion of #31368