Add ActionController::Renderers.remove.
Remove :timestamp column type

The `:timestamp` type for columns is unused. All database adapters treat
them as the same database type. All code in `ActiveRecord` which changes
its behavior based on the column's type acts the same in both cases.
However, when the type is passed to code that checks for the `:datetime`
type, but not `:timestamp` (such as XML serialization), the result is
unexpected behavior.

Existing schema definitions will continue to work, and the `timestamp`
type is transparently aliased to `datetime`.
Merge pull request #15184 from sgrif/sg-remove-timestamp-type

Remove :timestamp column type
Revert "Rewrite journey routes formatter for performance"

This reverts commit 5c224de9e110763ec7a0f01f5b604bcf81f40bfb.

Conflicts:
	actionpack/lib/action_dispatch/journey/visitors.rb

5c224de9e110763ec7a0f01f5b604bcf81f40bfb introduced a bug in the
formatter.  This commit includes a regression test.
fix escaping in generation
make the AST go from left to right, rather than right to left
Merge pull request #15178 from zuhao/refactor_actionpack_respond_with_test

Deregister csv renderer after test to prevent leak.
Add using_resouce_with_json to controller.
Merge pull request #15182 from zuhao/refactor_actionpack_respond_with_test_2

Un-define :to_json for Customer class after stubbing.
docs, `instantiate` expects `String` keys. [Rafal Piekarski & Yves Senn]

Closes #15122
Closes #15107
fix `rake test_sqlite3_mem`.

While running Sqlite3 memory tests I encountered the following error:

```
Finished in 69.416366s, 58.0267 runs/s, 162.3681 assertions/s.

  1) Error:
ActiveRecord::Migration::ChangeSchemaTest#test_add_column_with_timestamp_type:
NoMethodError: undefined method `type' for nil:NilClass
    /Users/senny/Projects/rails/activerecord/test/cases/migration/change_schema_test.rb:244:in `test_add_column_with_timestamp_type'

4028 runs, 11271 assertions, 0 failures, 1 errors, 1 skips
```

This was because the table `testings` was used in multiple test-cases.
This resulted in a wrongly cached schema on `ActiveRecord::Base.schema_chae`.

/cc @zuhao
Use generated binstubs in guides examples.

[ci skip]
Merge pull request #15192 from simi/guides-binstubs

Use generated binstubs in guides examples. [ci skip]
Fixed the inferred table name for HABTM within a schema

Fixes #14824.
Merge pull request #14965 from eric-chahin/issue_14824

Fixed the inferred table name of a HABTM auxiliar
Delegate `#type_cast` to injected type objects on SQLite3
Merge pull request #15197 from sgrif/sg-delegate-type-cast-sqlite3

Delegate `#type_cast` to injected type objects on SQLite3
Delegate type_cast to injected type object in mysql
Have Postgres OID types inherit from general types

Using general types where possible. Several more can go away once
infinity gets figured out.
Merge pull request #15198 from sgrif/sg-delegate-type-cast-mysql

Delegate type_cast to injected type object in mysql