Fixes #4277: `yii\grid\GridView` is no longer throwing an exception in non-debug mode when results are empty and `columns` aren't defined

Fixes #5627: Added `yii cache/flush-schema` console command to flush DB schema cache of a given database connection

Fixes #6271: Query caching returns the same data when running the same SQL with different fetch modes

Fixes #6236: No JS scripts should be registered when `yii\widgets\ActiveForm::enableClientScript` is false

fixes #5448

Fixes #6207: Added support for truncating HTML strings using `StringHelper::truncate()` and `StringHelper::truncateWords()`

new private method `truncateHtml` now used by `truncate` and `truncateWords`

Fixes #5504: Added note to yii\console\CacheController explaining that cache components should be configured in console app configuration in order to be cleared

only method stubs so far

was already supported for BETWEEN but not for LIKE

fixes #6164

fixes #6164

Fixes #4823 and #6005: `yii message` accuracy and error handling were improved by using PHP tokenizer instead of regular expressions. Removed eval() as well.

Fixes #6107 and #6112: `yii message` was emptying existing translations and incorrectly writing not yet translated strings in .po in case of multiple categories

fixes #5683

issue #6126

- Responsive tables.
- Route is displayed by default, action is available as tooltip.
- Better config table display.
- PHP extensions are sorted alphabetically.

close #6099

Fixes #4643: Extra options specified in `yii\widgets\Breadcrumbs::links` will be treated as HTML attributes for the generated hyperlinks