The version used does not support the new json-ld format yet and errors
out.

This is ised to flatten objects for the proerties panel.

The change of moving some properties to sub objects broke the creation 
of the combinedProperties object, which can't deal with nested objects. 
To circumvent that all elements are now flattened before being combined.
The connected property panels now again look for the properties on the 
element itself and not in sub-objects.

If the property is set, the video will be scaled as far as its
container (static element or grid) allows, otherwise only up to its
maximum native size.

If the property is set, the image will be scaled as far as its
container (static element or grid) allows, otherwise only up to its
maximum native size.

When the magnifier was moved to the right of an image, there was a
possibility that a scroll bar would flare up, depending on the size
of the image. By subtracting the frame width of the magnifier the error
is fixed.

- Dnd values now have a special type that has an ID, a string and
  another string for an image path.
- A new dialog exists for editing thoe options. Similarly to the likert
  header.

Use verona-module-metadata.json to define json meta data in html header

- Fix the name to not have redundant 'component' suffix
- Move template to its own file

Broke during the refactoring of the element models. Now correctly uses 
the positionProps field.

Also improve variable naming.

This is the same hack used in the editor for overlay elements. Here 
applied to the actual dnd elements seen in the player.

Explanation: The cursor can not be applied to the dragged elements as it 
is not positioned (at least that is my understanding). The workaround is 
to style the body (cursor) while anything is being dragged.

If the virtual keyboard with numbers (or with numbers and operators) is
used, input via the normal keyboard is also restricted to these
characters.

It is meant to be used as inline positioned (sub) element. Therefore it 
has not postioning information and less property options than the normal 
drop list. Similar to the simple text field.

MatButtonModule is used in all projects!

The interaction can now be turned off without hiding the button.

If maxRuns at minRuns had the same value, the valid state of an audio
could not be set. Therefore no event was sent to other audios and videos

The latest changes to the events for the control bar have so far been
implemented only for the audio component

This helps to find the asset path for images
when they are imported from the js context