Fixes #3638: `yii\filters\HttpCache` does not work as expected when session is started before the filter

Improved action filter and action execution flow by supporting installing action filters at controller, module and application levels

issue #2852

- added example code for application components
- added missing short description

[ci skip]

This reverts commit 9d7597d6, reversing
changes made to 6b6390f7.

Appended newlines to every PHP document that did not have a newline as the last character in the file.