[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
     */
```
> Also same explode() implode() on newlines is done here that changes newlines

That's not a problem. The phpdoc_params fixer does the same thing.