* 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
The following changes are made by this PR:
* Translation bundles now implement MaterialLocalizations directly,
and are public so that they can be directly extended.
* The list of supported languages is now a generated constant.
* The icuShortTimePattern/TimeOfDayFormat values are now pre-parsed.
* Various other changes for consistency with the style guide and the
rest of the codebase, e.g. the class names don't use `_`, the
`path` library is imported as such, more dartdocs, fewer `//
ignore`s, validation using exceptions.
This reduces our technical debt benchmark.
