* show device list in flutter doctor output
fixes https://github.com/flutter/flutter/issues/5625

* improve device matching error message
fixes https://github.com/flutter/flutter/issues/5675

* fix getDeviceById to match exact name
fixes https://github.com/flutter/flutter/issues/5508

- [x] Refactor view support into separate classes.
- [x] Make the hot runner grab the main view and call runFromSource on it.
- [x] Remove Device.needsDevFS (because it is always true).

* send ext.flutter.debugDumpApp; ext.flutter.reassemble

* expose debugDumpRenderTree

Enable launching applications on the iOS device with observatory and diagnostics server connected. (#4424)

* send supportsRestart flag when starting an app

* remove unused imports

* review comments

* refactor the --resident run option into a separate file

* update daemon to run --resident apps

* re-plumbing daemon start

* send app logs

* update tests

* review changes

* fix test runner

* remove PackageMap.createGlobalInstance; rely on the ctor

* review comments

* working on making a faster flutter run restart

* clean up todos; fire events on isolate changes

* use the Flutter.FrameworkInitialization event

* review comments

For consistency.

Fixes #4142

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

Quick pass at fixing a few dangling references as revealed by the new `comment_references` lint (https://github.com/dart-lang/linter/issues/240).

There's a bunch more to do here before we can turn it on by default (~430 lints as of now).  Many of them are a simple matter of adding an import (e.g., `dart:async` for library docs that reference `Future`) but others will require a bit of thought.  Probably best done by the folks writing the code. :)

This also fixes some related problems affecting "flutter run":
  * FLXes built during AndroidDevice.startApp need to match the build mode
  * APKs should always be rebuilt if the build mode uses AOT compilation

* rename service_protocol.dart to protocol_discovery.dart

* add a wrapper around the obs. protocol

* use json-rpc in run

* consolidate obs. code; implement flutter run --benchmark

* review comments

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

Host tools can be found in the artifact cache directory for the host platform.
If a developer wants to use a local engine build instead, then provide an
--engine-build flag that selects the specific engine build variant.

* send ext.flutter.exit

* listen for help restart, quit

* refactor into a separate class

* fix analysis errors

* review comments; fix test

* re-add an export for debugPrint

* rework flutter run

* fix npe with --debug-port

* connect to obs and exit when that conneciton closes

* update todos

* use the new cache code to locate more artifacts

* add todo

* review comments

* better messaging about windows support

* fix lints

Add a command that can capture a Skia picture of a Flutter frame and send it to a file or skiaserve debugger (#3165)

Well, all the easy ones, anyway.

For some reason `// ignore:` isn't working for me so I've disabled
lints that need that. Also disabled those that require a ton of work
(which I'm doing, but not in this PR, to keep it reviewable).

This adds:
- avoid_init_to_null
- library_names
- package_api_docs
- package_names
- package_prefixed_library_names
- prefer_is_not_empty
- sort_constructors_first
- sort_unnamed_constructors_first
- unnecessary_getters_setters