* dart fix --apply

* manual fixes

* fix after merge conflicts

* review

* Removes retries from "pub get" and proxies its stdout output

* Fix issue where ErrorHandlingProcessManager does not forward "mode" parameter to backing ProcessManager's "start" method

* Make "pub get" use ProcessStartMode.inheritStdio instead of forwarding bytes to stdout and stderr

* Fix tests

* Remove unused env var

* Add back 'Running "flutter pub get"...' status log

* Fix indent

* Add Pub.test() constructor which lets tests mock stdio

This reverts commit cb378edc.

* opt out the flutter tool

* oops EOF

* fix import

* Update tool_backend.dart

* Update daemon_client.dart

* fix more

* Reland: [flutter_tools] File system utilities

* Remove unused imports

This reverts commit 03496606.

[flutter_tool] Refactor Logger and Terminal to (mostly) no longer depend directly on context (#47269)

Revert "[flutter_tool] Prevent accidental calls to io.exit when asserts are active in unit tests (#46210)" (#46630)

This reverts commit b698c9d7.

* 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

* implicit-casts:false on flutter_tools/lib

* address review comments

* use castStringKeyedMap

* introduce {bool,string,strings}Arg

* fix ci