all fine now

closes #2427

Update input-file-upload.md

fix docs

- Removed hacks since these are no longer required: https://github.com/Codeception/Codeception/commit/71db233985531f298264dc4ca0160d2aa1c83b7f
- Removed unused helper classes
- Added 2.0 style "actor" to config

Thanks to @Ragazzo and @DavertMik for helping with it.

`yii\mongodb\Collection::buildRegexCondition()` added.

Adjusted Connection::transaction to provide Connection instance by default instead of transaction instance

Minor consistency issue. See the following files for more details:
1. framework/views/migration.php
2. framework/console/controllers/MigrateController.php

Advanced app `User` model code style fixes

fixed indentation