Implement naive partial caching mechanism.

Add test for LogSubscriber

Use ActionView::Base#log_payload to store log_subscriber's payload, so we can pass cache result into it.

Fixed tests

Remove useless settings

Check if #log_payload exists before calling it. Because other classes also includes CacheHelper but don't have is attribute

Use @log_payload_for_partial_reder instead of #log_payload to carry ActionView's payload.

Update test's hash syntax

Add configuration to enable/disable fragment caching logging

Remove unless test and add new test to ensure cache info won't effect next rendering's log

Move :enable_fragment_cache_logging config from ActionView to ActionPack

Apply new config to tests

Update actionview's changelog

Update configuration guide

Improve actionview's changelog

Refactor PartialRenderer#render and log tests

Mute subscriber's log instead of disabling instrumentation.

Fix typo, remove useless comment and use new hash syntax

Improve actionpack's log_subscriber test

Fix rebase mistake

Apply new config to all caching intstrument actions

The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.

An optimization was introduced in
https://github.com/rails/rails/commit/27f4ffd11a91b534fde9b484cb7c4e515ec0fe77
which tried to `#to_ary` the collection to prevent unnecessary queries
for ActiveRecord scopes/relations. If the given collection did not
respond to `#to_ary`, and empty collection was returned. That meant you
couldn't use collections built from `Enumerator` nor `Enumerable`.

With this change, `#collection_from_options` will attempt the
optimization, but fall back to passing along the given collection,
as-is.

Where appropriate, prefer the more concise Regexp#match?,
String#include?, String#start_with?, or String#end_with?

setup in ActiveSupport::LogSubscriber::TestHelper call set_logger that
will change ActionController::Base.logger to the MockLogger so that
logger will be always MockLogger

- Renamed test to be more descriptive

This is based on https://github.com/kangax/html-minifier/blob/6b2d4536d82819143b468b41a89c700b6c61631f/src/htmlminifier.js#L197 and
spec from https://www.w3.org/TR/html51/single-page.html.

Couple of other changes to tests due to support update:
- autobuffer has been dropped in favour of preload attribute, ref: https://msdn.microsoft.com/en-us/library/ff974743(v=vs.85).aspx
- pubdate attribute has been dropped from spec, ref:  https://www.w3.org/html/wg/tracker/issues/185

A change was made in the helper that renders the `datetime`,
being now by default `datetime-local` and creating
an alias of `datetime-local` for `datetime`, `datetime` tag and
it passes to be an abstract class for all other tags that inherit from him.

As a new specification of the HTML 5 the text field type `datetime`
will no longer exist and will pass a `datetime-local`.
Ref: https://html.spec.whatwg.org/multipage/forms.html#local-date-and-time-state-(type=datetime-local)

The reason we are reverting this commit is because it created breaking
changes for file upload gems. For more information see discussion here:
https://github.com/rails/rails/issues/17947#issuecomment-225154294

This reverts commit c4558178, reversing
changes made to 8b3cd74b.

Conflicts:
	actionview/CHANGELOG.md
	actionview/lib/action_view/helpers/form_helper.rb

In PR #24929 the changelog was updated to make note that while the new
template handler was changed to raw this changed the behavior when
outputting plain html or js files. Previously ERB would output the files
unescaped. Changing the default handler to RAW meant that these same
files would be rendered as escaped rather than as js or html.

Because of this change in behavior and after the discussion #24949 in we
decided to change the behavior of the Raw handler to output html_safe
strings by default.

Now files rendered with the default handler (raw) render the file
unescaped.

Fix digesting templates with identical logical names when requesting a format other than the first default

This test was broken by f650e032. It was
added by https://github.com/rails/rails/pull/17978, and is adequately
tested elsewhere. The reason that this breaks is that
`Controller#process` is not going to set a new response object, and we
now terminate in callbacks if the response has been sent. The only
reason that this test was calling `get` in the first place was because
the controller under test blows up if `request` was `nil`. The point
being that the failure is invalid, and I don't think we need to fix the
test in this location.

Confirm with the specification when generating emtpy option for select with `include_blank: true` option.
We now generate option with empty label, example:

`<select id="places" name="places"><option value="" label=" "></option></select>`

 for include_blank: true. This is only done, if content is missing on the option, and we providing the value from this option.

 Fixes #24816

[Rafael Mendonça França + Nick Sutterer + thedarkone]

Ruby 2.4 unifies Fixnum and Bignum into Integer: https://bugs.ruby-lang.org/issues/12005

* Forward compat with new unified Integer class in Ruby 2.4+.
* Backward compat with separate Fixnum/Bignum in Ruby 2.2 & 2.3.
* Drops needless Fixnum distinction in docs, preferring Integer.

Using locals will cause layouts to be cached multiple times in the
template cache.  This commit removes locals from consideration when
looking up the layout.

Will be using this in later code.

Each test executes in another tmp folder, so there's no chance
of polluting another test run.

Object#inspect recursively inspects instance variables, exposing all
internal state, including sensitive internal cache objects. Override
Cache#inspect to give a high-level summary that never interferes with
concurrent cache writes.

`date_select` helper `:with_css_classes` option now accepts a hash of strings
for `:year`, `:month`, `:day`, `:hour`, `:minute`, `:second` that will extend
the select type with the given css class value.

```erb
<%= f.date_select :birthday, with_css_classes: { month: "my-month", year: "my-year" } %>
```

```html
<select id="user_birthday_3i" name="user[birthday(3i)]">…</select>
<select id="user_birthday_2i" name="user[birthday(2i)]" class="my-month">…</select>
<select id="user_birthday_1i" name="user[birthday(1i)]" class="my-year">…</select>
```

Optional, add global `html_options` to modify every select tag in the set.

```erb
<%= f.date_select :birthday, with_css_classes: { month: "my-month", year: "my-year" }, { class: "my-date optional" } %>
```

Supported DateHelper methods: `select_day`, `select_month`, `select_year`,
`select_hour`, `select_minute`, `select_second`, `select_datetime`, `select_time`,
`time_select`, `date_select` and `datetime_select`.

`:with_css_classes` option was added to the `date_select` with #7975.

Datetime input type was removed from HTML specification.
One can use `datetime_local_field` and `datetime_local_field_tag` instead.

Follow up to #23980.