Changes related to DIP upload process, refs #7641

Include qtSwordPluginWorker in new jobs process:
- Add ability if qtSwordPlugin is enabled
- Use new job classes

Fixes in DIP upload process:
- Do not save target IO at the end, it was creating nested set problems, but update it in the ES index
- Register namespaces and use Xpath queries to allow namespaced and not namespaced METS versions
Ah I see. All right, if we need to do an if (...) anyway, let's keep the job together with the plugin. The rest looks good to me.