Fixed URL parsing so it's now properly giving 404 for URLs like `http://example.com//////site/about`

and 7ba6a063

when $_SERVER['HTTPS'] is "ON" it doesn't work well

this will result in objects that do not have the property anymore :-)

`yii\web\User::loginRequired()` now returns the `Response` object instead of exiting the application

Fixed `Call to a member function registerAssetFiles() on a non-object` in case of wrong `sourcePath` for an asset bundle

cleanup after #1479

Moved file and path related methods from StringHelper to FileHelper, renamed StringHelper byte methods not to be misused as string methods