Added support to allow an event handler to be inserted at the beginning of the existing event handler list
Improved action filter and action execution flow by supporting installing action filters at controller, module and application levels
Moved all filter classes to namespace `yii\filters`
fixed doc [skip ci]
Fixes #2986.
renamed `PrefixUrlRule` to `GroupUrlRule`
Update console-migrate.md

fixes #2989
Fixes #2816: Changed default date and time format of `yii\base\Formatter` to `Y-m-d` and `H:i:s`
Refactored rate limiting by turning RateLimiter into an action filter.
refactored authentication filters.
renamed "auth" to "authenticator". [skip ci]
Added missing translation
Sorted translations
Merge pull request #2995 from Theill11/update-danish-translation

Update danish translation [skip_ci]
Update logging.md

Currently `Yii::$app->log` is not the `yii\log\Logger`, but the `yii\log\Dispatcher`. Logger is transient component used indirectly and separately by the dispatcher and helper methods for logging.
Merge pull request #2980 from lubosdz/master

removed redundant whitespace, related to issue #2978
Add SyslogTarget
Clarify new usage of yii\web\View::render()

One paragraph description and one code snippet to clarify usage of yii\web\View::render() in a view context, as using echo is a significant change from partial view usage in Yii 1.1.
Merge pull request #3001 from hiltonjanfield/patch-1

Clarify new usage of yii\web\View::render()
doc fix [skip ci]