* Migrated all fixtures to PHP. * Removed version specific adjustments.
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.
We switched to PHPDataSets already but didn't migrate all usages. This commit now migrates all usages left behind.
