This patch changes the default `flutter create` command to generate a
HelloServices-style app on iOS. As a consequence, the Atom integration now
fully works with HelloServices.

The `flutter.buildMode` property now controls whether to build in debug,
profiling, or release.

Add a FLUTTER_MODE variable to the generated Xcconfig and fix snapshot generation on all targets. (#4362)

Get rid of the DART_EXPERIMENTAL_INTERPRETER_FLAG.

Fixes #4298

This patch updates how we generate xcconfig files to match what
xcode_backend.sh expects.

Fixes #4186

Wire up ios-profile and ios-release. Switching between debug, profile and release starts the build process from scratch. (#4063)

Artifacts from local engine builds will be found based on the --local-engine flag

* fix analysis errors

* review comments; fix test

* re-add an export for debugPrint

* rename the --develop option to --debug

* fail if both --debug and --deploy are specified

* use the new cache code to locate more artifacts

* add todo

* review comments

In case the user changes the path of the Flutter project on disk, the Dart SDK or the Flutter repository itself, the old Xcode paths would be invalid. Now, we rewrite them when we build the project.

Use the project name to initialize the bundle name and identifier

Revert "iOS: Treat the initial Info.plist string as a mustache template and use the project name to initialize the bundle name and identifier"

This reverts commit dd4361bc.

We still use the hard-coded name in a number of places, including
launching the app on the iOS simulator.

Fixes #1950

iOS: Treat the initial Info.plist string as a mustache template and use the project name to initialize the bundle name and identifier

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