#613

#610

#620

#618

#617

#579

#574

#558

#559

The directive for dynamic backgroudn color was outdated. Directive is 
removed and problem is solved via CSS custom variable.

#561

#449

- position
- label
- icon

- Replace throwing Errors with InstantiationErors in unit, page and
  section in strictInstantiation mode

- There is a page navigation only for not always visible pages
- Fix initialization of the button's action parameter