This has been refactored already. Those were not cleaned up properly.

This way the vertical size can be controlled.

Other elements do implement the interface but do nothing with the 
property. This make all the interface handling a lot easier at the cost 
of having useless variables in some contexts.

* Remove FormService Injection
* Move FormService and form types to player
* Move interface ValueChangeElement to uI-element.ts
* Use interface InputElementValue instead of
string | number | boolean | null

* Add `InputElementValue` as type when needed

Margin between lines and between button and it's label.

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.

Colors and font stuff.

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.

This is to avoid circle imports.

There is now a default method working the same as before. But elements 
(likert for now) can overwrite it and add some logic for specific 
properties.