* 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

Flutter tool's service client library tries to "upgrade" sub-components of service responses with higher level model objects. It does this for all members of the response, rather than only those documented in the version it targets, and it errors out when encountering a new type. This causes it to fail when a new field is introduced with a new typed. Clients are required to ignore this.

This was part of a disused tool to explain what did and did not run after reload.

* Register getFlutterVersion service in flutter_tools.

* Add short revision ids to response.

* Rename method and remove obsolete comments.

* Fix broken test by adding sendPeerNotifications flag.

* Implement mockPeer.sendNotification.

This relands https://github.com/flutter/flutter/pull/35297

The followings have been done to fix the broken tests:
  1. Add `didSendFirstFrameRasterizedEvent` extension and its tests
  2. Wait for `didSendFirstFrameRasterizedEvent` instead of
     `didSendFirstFrameEvent` during start up tests
  3. Mark missed (probably newly added) start up tests as flaky

* Use the new service protocol message names
  clearVMTimeline
  setVMTimelineFlags
  getVMTimeline
  getVMTimelineFlags

* Fix clearTimeline at another spot.

* use null aware operators

* rollback changes about null-aware operator

* disable lint prefer_is_not_empty

This reverts commit c0d5fd23.

* Update packages
* Capture JSON RPC errors that presently get swallowed

* Check for invalid elevation usage in the layer tree

* some space formattings

* always use blocks in if-else if a block is used

* format spaces in for and while

* allow multiline if conditions

* fix missing space

* fix indentof statements in BlockFunctionBody

* fix indentof statements in BlockFunctionBody in tests

* add trailing commas on list/map/parameters

* add trailing commas on Invocation with nb of arg>1

* add commas for widget containing widgets

* add trailing commas if instantiation contains trailing comma

* revert bad change

This fixes https://github.com/flutter/flutter/issues/28374

The fact that json_rpc_2 is hiding exceptions like this might be a
bigger issue: https://github.com/flutter/flutter/issues/28531

Merge on red because add2app test is currently flaking out according to @dnfield 

* fix some bad indentations

* remove suspicious line