Fixes #6398: Added support for specifying dependent component in terms of a configuration array for classes such as `DbCache`

#4471: `yii\caching\ApcCache` now returns array in case of APC is installed but not enabled in CLI mode

- can be used to enable caching in a request without the need for any storage
- useful for example in complex console tasks that should still be independed

Fixes #4051: Renamed `yii\caching\GroupDependency` to `TagDependency` and added support for associating multiple tags to a single cached data item

Fixes #2558: Enhanced support for memcached by adding `yii\caching\MemCache::persistentId` and `yii\caching\MemCache::options`

Adjustments code according to the standards.
Adding missing PHPDoc comment.

issue #2852

CS fix.

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