Feature/comment commenter gadget

see #29 for reference, so far we would like to test

* [ ] `// @todo`
* [ ] `// dont commit` or something similar

both features can be enabled/disabled in the config
this method ist very difficult to read.... can you please add between steps?

```php
$tokens = token_get_all(file_get_contents($filename));
$commentTokens = array_filter($tokens, function ($token) {
    return (count($token) === 3) && (in_array($token[0], [372 /* T_COMMENT */, 373 /* T_DOC_COMMENT */])); 
});

return array_map(function ($comment) {
    return [
        'content' => $comment[1],
        'line'    => $comment[2],
    ];
}, $commentTokens);
```