issue #746

see https://github.com/yiisoft/yii2/commit/bf599b96bb47f006a0f6fb4859ead30648fc5dde

fixes #4012

Manifest was not passed to view as was expected according to phpdoc.
We need it to extract status codes for filter.

Arbitrary http status codes are hardcoded in filter so it is impossible to search by status code not present in select.

See #4000

Incorrect character for generating docs. See http://www.yiiframework.com/doc-2.0/yii-bootstrap-activeform.html

- Removed `form_begin`, `form_end`
- Added `use()` and `ViewRenderer::uses` that are importing classes and namespaces
- Added widget dynamic functions `*_begin`, `*_end`, `*_widget`, `widget_end`
- Added more tests