* Remove the workaround that pinned args to v0.13.6
This reverts most of the changes in commit 6331b6c8
* throw exception if exit code is not an integer
* rework command infrastructure to throw ToolExit when non-zero exitCode
* convert commands to return Future<Null>
* cleanup remaining commands to use throwToolExit for non-zero exit code
* remove isUnusual exception message
* add type annotations for updated args package

Exception in Flutter Gallery / Dialogs Demo #6826

Fixes https://github.com/flutter/flutter/issues/6690

Also add a version of the Gallery smoke test that enables semantics

* Commit the IhtelliJ project metadata for the Gallery

* Add default run config for Gallery

* Add back ignore of .idea per review feedback

I think we must have accidentally checked this in some time.

FormField is now a widget that can contain any type of field. Input no
longer has special code to handle form fields. Instead, there is a
helper widget InputFormField for using an Input inside a FormField.

Fixes https://github.com/flutter/flutter/issues/6097 and based on
feedback from the same.

Fixes #6417

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

Fixes https://github.com/flutter/flutter/issues/6561

See https://github.com/flutter/flutter/issues/6539

Soon the engine will send this information through platform messages.

Since we can change the theme's platform, we need to make sure we
propagate that throughout rather than having half the app use the native
platform and half the app use the selected platform.

This partially reverts https://github.com/flutter/flutter/issues/626 ,
but horizontal padding is not in the spec, so we still match the spec.

This patch removes our dependency on asset_bundle.mojom.

This patch removes uses of keyboard.mojom in favor of the
TextInputPlugin.

Developers need to get the size of the BuildContext sufficiently often
that we should provide a convenient getter for the value. Having this
getter is also an opportunity to catch common mistakes and provide
useful error messages that guide developers towards better patterns.

Fixes #2321