Issue #169: Annotation assignment not working correctly

[pkluegl]

Issue #170: Type based annotation assignments should only add visible annotations Issue #171: Support implicit FSArray assigments with FeatureStructures

What's in the PR

• added and fixed tests
• filter on visibilty when selecting annotations
• fix assignment with full namespace
• better support featre structures in lists

How to test manually

• ...

Automatic testing

• [x] PR adds/updates unit tests

Documentation

• [ ] PR adds/updates documentation

Organizational

• [ ] PR includes new dependencies. _{^{Only dependencies under approved licenses are allowed. LICENSE and NOTICE files in the respective modules where dependencies have been added as well as in the project root have been updated.}}