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Partial revert of #d650b71 'Remove deprecated stuff in ActionController'
This brings back the deprecated modules from ActionController, because
they didn't have any deprecation warning.
Remove deprecated stuff in ActionController
This removes all deprecated classes in ActionController related to
Routing, Abstract Request/Response and Integration/IntegrationTest.
All tests and docs were changed to ActionDispatch instead of ActionController.
Move integration test runner into ActionDispatch