update dependencies; add a Web smoke test

This introduces a script that implements the conventions described in https://github.com/flutter/tests/pull/1.

* Add Colors.white38

* Update ThemeData.disabledColor and ButtonThemeData.disabledColor to Colors.white38

* Update pre-existing tests to expect Colors.white38 instead of Colors.white30

* Update API documentation to reflect these changes

Change Xcode project developmentRegion to 'en' and plist CFBundleDevelopmentRegion to DEVELOPMENT_LANGUAGE (#34293)

Disable CocoaPods input and output paths in Xcode build phase and adopt new Xcode build system (#34167)

Updates the Podfile template to use the CocoaPod disable_input_output_paths installation option which prevents the [CP] Embed Pods Frameworks build phase from outputting the Flutter.framework files.

Revert "Disable CocoaPods input and output paths in Xcode build phase and adopt new Xcode build system (#33852)" (#33882)

This reverts commit d053fe5c.

Disable CocoaPods input and output paths in Xcode build phase and adopt new Xcode build system (#33852)

Updates the Podfile template to use the CocoaPod disable_input_output_paths installation option which prevents the [CP] Embed Pods Frameworks build phase from outputting the Flutter.framework files.

Revert "Disable CocoaPods input and output paths in Xcode build phase and adopt new Xcode build system (#33684)"

This reverts commit ef792fc3.

Disable CocoaPods input and output paths in Xcode build phase and adopt new Xcode build system (#33684)

Updates the Podfile template to use the CocoaPod disable_input_output_paths installation option which prevents the [CP] Embed Pods Frameworks build phase from outputting the Flutter.framework files.

Revert "fix devicelab manfiest (#33698)"

This reverts commit 5a6a00dc.
This reverts commit 0d79f0fc.

This relands flutter/flutter#33163 with a fix to the integration_ui test.

This reverts commit 52ae9968.

Updates documentation and non-public API to use American spellings for
consistency with the rest of the codebase.

No changes to behaviour... other than how it's spelt.

* Clean up some flutter_tools tests

* Remove arbitrary retry that happens even for fundamental errors, and generally clean up _DevFSHttpWriter.

* Update dependencies (requires fixes; see next commit)

* Fixes for new dependencies.

* Updating dart.dev related links

* Update packages/flutter_tools/lib/src/base/context.dart

* Update packages
* Capture JSON RPC errors that presently get swallowed