#453

Material update fix

causes problems after update

#452

... to create a new reference for options property.

Measure holds the value and a unit for CSS properties.

- Reformat styles

- Reformat styles

- Reformat styles

- Reformat styles

- Reformat styles

- Reformat styles

Replace resize event listener with ResizeObserver to also detect size
changes of the surrounding grid

- Replace UpdateTextareaPipe with DynamicRowsDirective

The dynamic height of the textarea is calculated based on the available
width. However, accessing the width of the textarea often results in an
error.
For this reason, the calculation is now done using resize and change
events in conjunction with a timeout to wait for the textarea to render.

- Use scss extension fpr styles file

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

- Prepare usage in editor
- Remove test from ScrollPagePipe, because the call to "new Page" expected
  the initialization of GeometryComponent

- Add spans with 'nbsp;' to images to be able to align drop lists of
  cloze elements with images to the baseline.