#293

Also add it to the likert row dialog.

#112

#283

Also refactor properties panel and ToggleButton class logic for striking 
values. This now relies more on CSS classes provided by Material instead 
of doing finetuned logic my ourselves. This also allows showing the 
correct preview in the editor.

#287

- Move props to separate files
- Fix typing

Also improve media element property control layout.

#204

Now the dialog scrolls and the buttons at the bottom can be reached even 
on low viewport height.

#294

#283

Casting to ButtonElement caused issues where changed values were not 
recognized by inputs.

#280

The TipTap editor needs a setting to be able to read base64 encoded 
images.

Also improve method name.

#297

#298

..instead of multiple methods doing almost the same stuff.

- Use done event of keyboard animation to set the scroll position
of the element
- In small browser views elements are scrolled to the top of the view
instead of the middle of the view

Turns out the space within the template code are doing this.

#270

More german quoting characters.

#209

There was at least one bug, where entering a number could create a list 
with wrong styles. This is the easy fix by disabling all that, instead 
of fixing it, which might bo out of our jurisdiction anyway.

#226

Better icons and reordered elements.

#267

Italics indicate that this is not a proper text.

- Missing type inforamtion as constructor parameter
- Also the new ID generation mechanism uses the type of the element to 
request an ID from the the IDManager. Here was a mismatch, where the 
type is 'likert-row', but the IDManager only knew 'likert_row'. This is 
now files all IDs use hyphens instead of underscores.

This is needed in on drop logic to set the new value.

The dragged image did contain carry information about it's element.
Also remove useless drag and drop functionality for the placeholder.

Remove 'any's be adding proper types and using 'never'.

- problem with nullish values