Previously setting simple values to the config.x object resulted in the
following:

    config.x.super_debugger = true
    config.x.super_debugger #=> {}

Which was against the examples showed in the changelog/release notes.

Godfrey Chan, Genadi Samokovarov

This reverts commit de489134.

Conflicts:
	railties/lib/rails/railtie/configuration.rb

It added regression. Will be back after the beta

Mention web-console in 4.2 release notes

[ci skip] Added documentation for belongs_to scope parameter

Mention the web-console inclusion in the default Gemfile in the Release
notes and the railties changelog. We can eventually mention it in the
upgrade guide, if needed.

[ci skip]

'abstract_unit'.

cc #16564

Move TimeHelperTest to TimeTravelTest from `as/test_test.rb`

Add default .raise_in_transactional_callbacks option to template

Correctly determine if migration is needed.

Improve custom configuration

Related with #11795.

Update `ActionController::Parameters` to be more secure on parameters handling

Add missing AS require

`strip_heredoc` method is defined on active_support/core_ext/string

1. Hashes can be assigned
2. We don't need a special level anymore

The method chain only works in the top level.

If users need a second level they need to assign a OrderedOptions to the
key:

    config.resque.server = ActiveSupport::OrderedOptions.new
    config.resque.server.url = "http://localhost"
    config.resque.server.port = 3000

[Rafael Mendonça França + Carlos Antonio da Silva]

Conflicts:
	actionpack/lib/action_controller/metal/mime_responds.rb
	actionview/lib/action_view/vendor/html-scanner/html/sanitizer.rb
	activerecord/lib/active_record/type/value.rb

Small grammar fix in pluck description

Do not depend on queue_classic on JRuby

4.2 Release Notes pass [ci skip]

[ci skip] config.active_record.errors_in_transactional_callbacks -> config.active_record.raise_in_transactional_callbacks