Fixes #6283

* cleanup obtaining user home directory path
* refactor doctor and detect IntelliJ on Mac
* fix detect Flutter plugin for IntelliJ

fixes https://github.com/flutter/flutter/issues/6163

As of Xcode 7, Apple recommends setting CFBundleIdentifier to
$(PRODUCT_BUNDLE_IDENTIFIER).

Fixes https://github.com/flutter/flutter/issues/5775

Related: b5f763b4

* make flutter run work with a pre-built apk

* refactor to remove the buildDir param

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.

* Fix `flutter upgrade`

* Fix builds on iOS

Fixes #4298

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

* show build progress; print app sizes

* add todo

* review comments

* remove unused import

This reverts commit 8f69cccc.

This passes the information through Xcode to the `flutter build aot` call via
the environment so that it picks up the right artifacts.

Fixes #4186

* iOS tools cleanup

1) Fix `flutter install` on both device and simulator to refer to the actual
   bundle and not just the .generated folder
2) Fix `flutter run` on device to actually run vs just installing

Still TODO:
1) Discovered that isAppInstalled on iOS simulator always reports true,
   meaning it'll never actually try to install the app.

Fixes #3947
Fixes #1823

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

* fix analysis errors

* review comments; fix test

* re-add an export for debugPrint

Add a `--no-codesign` option to `ios build` to disable code signing.

Build bots only have 7.0.