* 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

* Revert "Turn off docs upload temporarily (#44365) (#44413)"

This reverts commit 8f2ea9d0.

* Re enables docs upload

* Revert "Turn off docs upload temporarily (#44365)"

This reverts commit 3dd67410.

* show contents of firebase-debug.log

Turning off Docs upload temporarily until Firebase outage is over.
Landing on red to fix the build.

This reverts commit 3ca76098.

This version of dartdoc properly escapes fenced code block "info strings."

* deploy to .dev firebase projects.

* Updated secrets for .dev web sites.

* Fixed missing docs.*.io references.

This fixes the offline Dash/Zeal docs generation to use the newly added dartdoc markers for different entity types to make it more exact when finding entity names.

Bumped Dartdoc to the next release.

This changes the DocSetPlatformFamily key to be "dartlang" instead of the name of the package (usually "flutter"). This is so that the IntelliJ plugin for Dash will be able to go directly to the docs for a symbol from a keystroke, instead of needing to search all the docsets each time.

Without this, flutter isn't part of the list of package names it searches. After this, it finds the flutter docs because they're declared to be part of the "dartlang" family of docs.

Dashing doesn't have a way to configure this, so we modify the Info.plist directly to make the change.

This sets the favicon for the offline Dash/Zeal docs.

Also, sets up the OpenSearch Description metadata file so that people can create custom search shortcuts for the API docs site.

Fixes #6412

Hopefully Firebase is all done compacting now, so we're going to try and build docs again.

(re-land of #24244)

This generates a zip file containing all of the docs, and uploads it when we publish docs, as well as a
Dash/Zeal docset that contains a feed of the docs.

Addresses at least part of #9955

Landing on red in order to fix the build.

This reverts commit f3a4f7e8.

Accidental merge on red.

This generates a zip file containing all of the docs, and uploads it when we publish docs, as well as a
Dash/Zeal docset that contains a feed of the docs.

Addresses at least part of #9955

This reverts commit 3c56e6c7.

It breaks the AOT build.

* first pass

* revert WidgetsBindingObserver

* disable prefer_mixin

* docs and more mixins

* newer engine; binding fixes

* upgrade dependencies

* fix test binding

* remove whitespace

* remove the obsolete `enableSuperMixins: true`

* upgrade dartdoc to 0.22.0

* temporarily use git version of dartdoc

* fix pub global activate syntax

* use dartdoc 0.23.0