deprecated trait should turn all methods deprecated

```php
<?php

declare(strict_types=1);

/**
 * @deprecated use something else
 */
trait MyTrait
{
	public function doFoo()
	{
	}
}

class X
{
	use MyTrait;
}

$x = new X();
$x->doFoo();

```

I think we should see deprecation messages for every trait-method beeing called, when the trait itself is marked deprecated.