We'll use this functionality to implement some subtle behaviors for tooltips.

* modernize `flutter drive` w.r.t. debug/profil/release options

* make error message prettier

There are still many more left before rendering.dart is complete.

Bump dart SDK to 1.17.0-dev.6.

Remove spurious padding.

Fixes #3980
Fixes #3560

We now explain what coordinate system each argument is expected to be in.

Fixes #4205

* working on making a faster flutter run restart

* clean up todos; fire events on isolate changes

* use the Flutter.FrameworkInitialization event

* review comments

* resolve symlinks in paths to flutter

* review comments

We weren't listening to the decorations to see when they loaded.

Fixes #4185

This reverts commit 8f69cccc.

The new version has an API change. Also, up our SDK requirements to be a
bit more realistic.

* dissallow -release mode on emulators

* have the help text print the default mode

New dev build with more fixes and (fingers-crossed) speed-ups.

Fixes #4186

* fixed issue #4179 bin/flutter fails when linked with relative symlink

* fixed issue #4179 bin/flutter fails when linked with relative symlink

* My second attempt at following symlinks correctly

* compress text assets for docs, when uploading

* reorder args

* ensure old files are deleted

* recurse on the cp

* set source path correctly

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

This reverts commit d4d74d9c.

Address feedback from material design team.

Fixes #4144
Fixes #4145
Fixes #4146

For consistency.

Fixes #4142

Fixes #4114

When building AOT, we now run `pub get` instead of printing an error telling
the user to run `pub get`. We can remove this code once the bug reference above
is fixed (should be a couple days).

* 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

The app.a wasn't getting pulled into the main executable because we weren't
referencing any of its symbols. Instead, create a dylib that can be packaged
with the application and loaded at runtime.