… same time

Also prepare for usikng the `Generator` in place of the current static config properties

This makes the `Generator` class the authority about whitelisted annotation
namespaces. A value of `null` is interpreted as wildcard.

Registers a new loader for each `Generator` instance. A new method
`withContext()` was also added to allow to run custom code in the context
of a configured `Generator`.

Shortcut version of `Parameter(in='path', required: true)`.

In addition to that it can be used as method parameter attribute. In that case the name
and (optiona) type-hint are automatically configured.

Example:
```
public function getProduct(#[OA\PathParameter] string $product_id) {
   // ...
}
```

Same as:
```
/**
 *   @OA\PathParameter(
 *     name="product_id",
 *     @OA\Schema(type="string")
 *   )
 */
```

The legacy `TokenAnalyser` can be used by specifying the `--legacy` (`-l`) option.