* App.framework must support iOS 8 for older Flutter projects

* Fix test

This reverts commit dd9323bd.

This reverts commit 43e28084.

This reverts commit 2054f37a.

* Move embedding and linking Flutter frameworks into the tool

* Unused import

* Migrate

* Rename run, add comments, remove typedef

* Add status log to tell the user what we did

* Remove Podfile migration, create IOSMigration superclass

* word-smiting
Co-Authored-By: Jonah Williams <jonahwilliams@google.com>

* for space
Co-Authored-By: Jonah Williams <jonahwilliams@google.com>
Co-authored-by: Jonah Williams <jonahwilliams@google.com>

Revert "Check Xcode build setting FULL_PRODUCT_NAME for the name of the built app during flutter run (#47266)" (#47568)

This reverts commit 648a5d8a.

Check Xcode build setting FULL_PRODUCT_NAME for the name of the built app during flutter run (#47266)

Revert "Check Xcode build setting FULL_PRODUCT_NAME for the name of the built app during flutter run (#46928)" (#47264)

This reverts commit e54e301d.

Check Xcode build setting FULL_PRODUCT_NAME for the name of the built app during flutter run (#46928)

* 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

* Remove use_modular_headers from Podfiles using libraries

* Remove @imports

If xcode_backend.sh script fails or substitute variables are missing, fail the host Xcode build (#37449)