This element has a list of string as editable options. Those strings 
form draggable elements which may be reordered or moved between 
different DropList elements.

Also refactor option change logic to allow any property not just the 
text property.

This works similarly to the standard radio group, but has a fixed 
horizontal layout with images above the options.

This way the color-input element can read the color and show the correct 
preview.

No longer is async. For elements which need upfront source info (media), 
the media prompf is done in the unit service. Here we can keep it 
simple.
Also remove coordinates from factory as this is information that does 
not need to be known here. This is also handled in the unit service 
where applicable.

To make it's purpose clearer.

Should at least be in util folder. And since it is imilar functionality 
to the unit factory it is placed within.

Before the defaults were simply set on any field regardless of the 
passed object.

This keeps import cycles from happening.