Revert "Move `analyzer_cli` into the SDK."

pkg/analyzer_cli/README.md

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-# dartanalyzer
-
-Use _dartanalyzer_ to statically analyze your code at the command line,
-checking for errors and warnings that are specified in the
-[Dart Language Specification](https://www.dartlang.org/docs/spec/).
-DartPad, code editors, and IDEs such as WebStorm use the same
-analysis engine that dartanalyzer uses.
-
-If you want to _contribute_ to the dartanalyzer project, see the
-[contributor docs](https://github.com/dart-lang/analyzer_cli/blob/master/CONTRIBUTOR.md).
-This page contains information about _using_ the dartanalyzer command-line tool.
-
-## Basic usage
-
-Run the analyzer from the top directory of the package.
-Here's an example of testing a Dart file.
-
-```
-dartanalyzer bin/test.dart
-```
-
-## Options
-
-The following are the most commonly used options for dartanalyzer:
-
-* `--packages=`<br>
- Specify the path to the package resolution configuration file.
- For more information see
- [Package Resolution Configuration File](https://github.com/lrhn/dep-pkgspec/blob/master/DEP-pkgspec.md).
-This option cannot be used with `--package-root`.
-
-* `--package-warnings`<br>
-  Show warnings not only for code in the specified .dart file and
-  others in its library, but also for libraries imported with `package:`.
-
-* `--options=`<br>
-  Specify the path to an analysis options file.
-
-* `--lints`<br>
-  Show the results from the linter.
-
-* `--no-hints`<br>
-  Don't show hints for improving the code.
-
-* `--ignore-unrecognized-flags`<br>
-  Rather than printing the help message,
-  ignore any unrecognized command-line flags.
-
-* `--version`<br>
-  Show the analyzer version.
-
-* `-h` _or_ `--help`<br>
-  Show all the command-line options.
-
-The following are advanced options to use with dartanalyzer:
-
-* `-b` _or_ `--batch`<br>
-  Run in batch mode.
-
-* `--dart-sdk=`<br>
-  Specify the directory that contains the Dart SDK.
-
-* `--fatal-warnings`<br>
-  Except for type warnings, treat warnings as fatal.
-
-* `--format=machine`<br>
-  Produce output in a format suitable for parsing.
-
-* `--url-mapping=libraryUri,/path/to/library.dart`<br>
-  Tells the analyzer to use the specified library as the source
-  for that particular import.
-
-The following options are deprecated:
-
-* `-p` _or_ `--package-root=`<br>
-  **Deprecated.** Specify the directory to search for any libraries that are
-  imported using `package:`. _This option is replaced as of Dart 1.12 with
-  `--packages`._
-
-* `--machine`<br>
-  **Deprecated.** Replaced by `--format`.
-
-* `--show-package-warnings`<br>
-  **Deprecated.** Replaced by `--package-warnings`.
-
-* `--show-sdk-warnings`<br>
-  **Deprecated.** Replaced by `--warnings`.