wisski 8.x-4.1

- Added an option to make textfields autocomplete only refer to already existing entities (last commit before release)
- Add basic CI
- Corrected WissKI module dependencies and configuration YAML
- Add WissKI API as official WissKI submodule
- More deleting options for missing and orphaned path entities
- Better WissKI SPARQL-Query Console.
- Add WissKI Authority Document module.
- Bugfixes in DOI module, Pathbuilder with Layout builder and Display Suite.
- Fixed path deletion and triples caching.
- Add new Authority File module.
- Fixed Excel export.
- Token authentication for Sparql11Engine.
- Download option for Mirador library.