Fixes https://github.com/flutter/flutter/issues/6280

Fixes #6417

* implement app.stop() for release runs

* update comment

* remove the validator check for atom

* remove the atom launch config

* review comments

Previously we weren't using all the different weights of the font.

Disable features of `flutter run` that depend on the service protocol when running in release mode (#6571)

TBR @abarth

...until people understand them.

Fixes #4166.
Fixes #5120.
Fixes #5399.
Fixes #6507.

Try to be clearer that flutter-dev is a public mailing list.

We now create the Completer inside TransitionRoute, as with the popped
completer. Also, test that this future resolves at the appropriate time.

Also eliminate unused accentColor-related properties.

Use the typography specified in the theme rather than Typography.white.

Fixes #6591

This makes https://flutter.io/basic-widgets/#layout-models redundant
with the dartdocs.

Fixes #6480

These aren't needed anymore.

This command is no longer needed. Also, remove some stray references to Mojo.

If a recognizer is interrupted by an exception from a callback, it could be
left in an inconsistent state and be unable to process future events

The theme fallback mechanism was busted by the shadowThemeOnly change.

Fixes #6562