it correct work with integer keys of list

Revert "Fixes #3469: Fixed the bug that `QueryBuilder::getColumnType()` may drop the provided column precision in certain cases"

This reverts commit a46efe79.

This reverts commit 70b57766.

Fixes #3469: Fixed the bug that `QueryBuilder::getColumnType()` may drop the provided column precision in certain cases

Fixes #3458: Fixed the bug that the image rendered by `CaptchaAction` was using a wrong content type

fixes #3431

Fixed the issue that `ServiceLocator` still returns the old component after calling `set()` with a new definition

Added `yii\console\Controller::EXIT_CODE_NORMAL` and `yii\console\Controller::EXIT_CODE_ERROR` constants, `yii\console\MigrateController` now returns `yii\console\Controller::EXIT_CODE_ERROR` in case of failed migration