LibraryView to JavaFX

Creation of a new JavaFX-based LibraryView in order to replace the old SWT-based implementation. The view shall be similar to the old one, hence control code may be reused.

To be discussed if and how this you will be handeled. Closely connected with ModelMarkerView (#3922) in current SWT-based implementation.

(from redmine: issue id 4019, created on 2020-05-12)

• Relations:
  • relates #3922
  • parent #4013