0.13.0

Release 0.13.0 (2018-04-30)

Baseline: fdee70e

Cherry picks:

• f083e76:
  windows: GetOutputRoot() returns GetHomeDir()
• fa36d2f:
  Automated rollback of commit
  4465dae.
• 4abd2ba:
  Add error message on empty public resources
• 2c95757:
  test-setup: remove leading "./" from test name

Incompatible changes:

• Remove //tools/defaults:android_jar. Use
  @bazel_tools//tools/android:android_jar instead.

• The flag --incompatible_show_all_print_messages is removed.
  Messages generated by print statements from any package will be
  displayed as
  DEBUG messages.

• The --incompatible_disallow_uncalled_set_constructor flag is no
  longer available, the set constructoris completely removed from Skylark. Usedepset` instead.

• Variables PACKAGE_NAME and REPOSITORY_NAME are deprecated in
  favor of
  functions package_name() and repository_name().

  https://docs.bazel.build/versions/master/skylark/lib/native.html#p
  ackage_name

• BUILD_TIMESTAMP now contains seconds (and not milliseconds) since
  the epoch.

New features:

• Strings have a new .elems() method, that provides an iterator on
  the characters of the string.
• Now you can access three functions in windows_cc_configure.bzl by:
  load("@bazel_tools/tools/cpp:windows_cc_configure.bzl",
  "<function_name>")

Important changes:

• CppRules: Unified action_configs for static libraries

• Remove support for blaze dump --vfs. It is no longer meaningful.

• Enable dependency checking for aar_import targets.

• internal_bootstrap_hack has been deprecated and removed.

• Properly handle tree artifacts on the link command line coming
  from a cc_library dependency.

• Allow C++ features to make proto_library emit smaller C++ code

• The 'j2objc' configuration fragment is exposed to Skylark.

• Remove the default content of the global bazelrc.

• In int() function, do not auto-detect base if input starts with
  '0'.

• Users can now pass --experimental_shortened_obj_file_path=true to
  have a shorter object file path, the object file paths (and all
  other related paths) will be constructed as following:
  If there's no two or more source files with the same base name:

  /<target_package_path>/_objs/<target_name>/<source_base
  _name>.
  otherwise:

  /<target_package_path>/_objs/<target_name>/N/<source_ba
  se_name>.
  N = the file?s order among the source files with the same
  basename, starts from 0.

• Move (c/cxx)opts from legacy_compile_flags to user_compile_flags

• CppRules: Remove optional_*_flag fields from CROSSTOOL, they are
  not
  used, and could be expressed using features.

• Introduce --incompatible_disable_objc_provider_resources to turn
  off all resource-related fields of the Objc provider.

• Removed the statement of "What does Bazel support?" as it's
  limiting/misleading. Added supported host OSes to
  "multi-platform" paragraph.

• android_library AAR output now contains proguard.txt

• Bazel now displays information about remote cache hits and
  execution strategies used in its UI after every build and test,
  and adds a corresponding line "process stats" to BuildToolLogs in
  BEP.

• Print correct build result for builds with --aspects flag.

• android_binary.manifest_merger is no longer supported.

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