Fixes #5735: Added `yii\bootstrap\Tabs::renderTabContent` to support manually rendering tab contents

Revert "Fixes #3760: Gii model generator now imports classes when necessary instead of using fully qualified class names"

This reverts commit 0c8faedd.

Fixes #3760: Gii model generator now imports classes when necessary instead of using fully qualified class names

Fixes #5682: The `asset` command would incorrectly combine CSS files when `UrlManager::linkAssets` is true

Fixes #5570: `yii\bootstrap\Tabs` would throw an exception if `content` is not set for one of its `items`
Fixes #5572.

Fixes #5665: The `currentPage` meta data in the RESTful result should be 1-based, similar to that in HTTP headers

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

Fixes #4457: Added support for using noscript for css files registered through asset bundles and Html helper

Fixes #5587: `json_encode` is now used with `JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE` where it makes sense, also it is now default for `Json::encode()`

Fixes #5402: Debugger was not loading when there were closures, resources or PDO instances in the logged data

fixes #5601

Fixed the bug that Gii console command help information does not contain global options

Fixes #5600: Allow configuring debug panels in `yii\debug\Module::panels` as panel class name strings

Fixes #5584: `yii\rbac\DbRbacManager` should not delete items when deleting a rule on a database not supporting cascade update

Fixes #5435: Added extra checks to `yii\rbac\DbManager` to prevent database exceptions when `$userId` is empty

Fixed `yii\console\controllers\AssetController` breaks CSS URLs in case target file localed at `yii\web\AssetManager::basePath` root