[FIX] Credentials actions

Most important change in this PR is change in ActionsBuilder.php on line 42.
Before that, a generator like that:

```yaml
builders:
    actions:
        params:
            object_actions:
                delete:
                    credentials: "hasRole('test')"
            batch_actions:
                delete: ~
```

will generate an bad ActionsController file because of bad merge (ActionsBuilderAction was not identified as "requiring checkCredentials function").

Now, it's working :)

@loostro, tested and ready to merge,