The latest dev build has stable summaries so we should start using them.

(Also ensures that analysis options are propogating to the SDK analysis context --- see:  https://github.com/dart-lang/sdk/issues/26129.)

* send ext.flutter.exit

* listen for help restart, quit

* refactor into a separate class

Fixes #3835

Fixes #3835

Update flutter_tools for the "unoptimized" engine build flag and the new output directory naming scheme (#3832)

Upgrade gradle files for Android Studio 2.1

Fixes #3833

* Use mojo clipboard service for copy/paste toolbar.

BUG=https://github.com/flutter/flutter/issues/1567

Fixes #417

Remove gratuitous pub resolver from flutter analysis.

Bump Dart SDK to 1.17.0-dev.2.0.

Package mapping is already done by the `PackageDependencyTracker` so this extra check is at best not needed.  (At worst could cause an unneeded and costly call to `pub list-package-dirs`!)

Analyze update to use in-memory package map.

Fixes #3795

Updates the analyze command to pass a package map to analysis rather than a file path.

This allows us to avoid creating a needless temporary `.packages` file and host directory and saves us a trip to disk to retrieve the contents when building our URI resolvers for analysis.

Fix analyzer error messages.

TextAlign applies to a whole paragraph instead of applying to an individual
text span. This patch moves the property out of TextStyle and into a separate
property on Text and RichText.

Will have the result of restoring `[static warning]` to `[warning]`, etc.

(This is essentially how we handle it in the analyzer CLI.)

Fixes #3759

Analysis re-work to use analyzer APIs.

It has no more clients.

Follow-up to #3734.

Fixes #2484

* avoid sending analytics on ci systems

* review comments

* Move global analysis options file to the repo root

Also restore the analysis options file for stocks example, since
the global options trigger warnings on generated intl files.

* Remove obsolete analysis options file for Material Gallery example