[WIP] Added phpdoc_separation fixer

The idea here is to go from:

```php
    /**
     * @param EngineInterface $templating
     * @return void
     */
```

to 

```php
    /**
     * @param EngineInterface $templating
     *
     * @return void
     */
```
Looks like this fixer does more then only separate return tag from other tags.

Also same explode() implode() on newlines is done here that changes newlines