The vendor was renamed from `wrm` to `werkraummedia`.
And the namespace vendor was renamed from `Wrm` to `WerkraumMedia`.
That way all references to PHP classes as well as the package name
itself need to be adjusted.
* Set ``alternative`` to the ``description`` if available.
* Set ``creator_tool`` to the "destination.one".
* Set ``source`` to the URL of the fetched image.
The usual use cases right now would involve a new file with a new URL.
That way we don't need to download existing files again.
That reduced network traffic, execution time and resource usage.
