Move core and coreimpl from corelib/ to lib/core and lib/coreimpl.

corelib/src/options.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// Dart core library.
-
-/**
- * The Options object allows accessing the arguments which have been passed to
- * the current isolate.
- */
-interface Options default RuntimeOptions {
-  /**
-   * A newly constructed Options object contains the arguments exactly as they
-   * have been passed to the isolate.
-   */
-  Options();
-
-  /**
-   * Returns a list of arguments that have been passed to this isolate. Any
-   * modifications to the list will be contained to the options object owning
-   * this list.
-   *
-   * If the execution environment does not support [arguments] an empty list
-   * is returned.
-   */
-  List<String> get arguments();
-
-  /**
-   * Returns the path of the executable used to run the script in this
-   * isolate.
-   *
-   * If the execution environment does not support [executable] an empty
-   * string is returned.
-   */
-  String get executable();
-
-  /**
-   * Returns the path of the script being run in this isolate.
-   *
-   * If the executable environment does not support [script] an empty
-   * string is returned.
-   */
-  String get script();
-}