* 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
This reverts commit ea21d0c542d05a7738a8357db48fe9490c25c621 which
didn't resolve the pagination control overflow issue. Commit
7425940d5be153430f98aa5b0735545f4a4fc3e5 replaces this as an alternate
workaround. Once flutter/flutter#7980 is resolved, we should revert
7425940d5be153430f98aa5b0735545f4a4fc3e5 and scroll instead.
