* 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
* Make it possible to override the FLUTTER_TEST env variable without unsetting it.
* Switch to using platform instead of Platform.
* Document the bindings, and introduce tests that initialize multiple WidgetsBindings with different environments.
* Add tests for the flutter platform test.
* Add license headers
* Fix lints
* Remove trailing whitespace
* Respond to Jonahs comments
* Respond to Ians comments
* Mock out the HttpServer in flutter_platform_test
* Mock out the HttpServer in flutter_platform_test
* Explain why we mock out the HttpServer in flutter_platform_test
