Attempt 1: replacing DLExpressivity by DLExpressivityChecker

[matentzn]

This is try to sort out the problem that the previous solution shows gibberish expressivity levels:

"expressivity": "RRESTRCUCINTUNIVRESTREROIF(D)". But it does not work..

Resolves [#ISSUE, resolves #ISSUE]

• [ ] docs/ have been added/updated
• [ ] tests have been added/updated
• [ ] mvn verify says all tests pass
• [ ] mvn site says all JavaDocs correct
• [ ] CHANGELOG.md has been updated

[DESCRIPTION, mentioning relevant #ISSUE]