Fixes #2723

Any font asset referenced in the fonts section of flutter.yaml will now be
included in the FLX assets.  It's no longer necessary to separately list the
font in the assets section.

filesystem or not.

Fixes #2113

All artifacts for iOS are universal.

In the spirit of https://github.com/flutter/flutter/issues/1220, remove the tear-off regexp in favor of in-line suppressions (if needed).

The new name format is "DEVICE_TYPE_NAME (Flutter)". For example:

iPhone 6 (Flutter)
iPhone 6s Plus (Flutter)

The names are taken from `xcrun simctl list --json devicetypes`.

Fixes #2682

Runs clean on the repo.  Moving ahead, we can manage exceptions via `.analysis_options` or specific source-level ignores.

Instead, require an AndroidManifest.xml and always build an APK.

Fixes #2517

This patch renames StatelessComponent to StatelessWidget and
StatefulComponent to StatefulWidget.

Fixes #2308

And fix the zillion issues that uncovered.

This reverts commit f41b3411, reversing
changes made to e33d8d96.

This was a bad check-in due to my mangling uploading a new version of the branch from a different machine.

This reverts https://github.com/flutter/flutter/pull/2639 and will be replaced by https://github.com/flutter/flutter/pull/2640