To not have the same name as likert rows and cause issues on the props 
panel.

The condition did not respect the case of null value.

And avoid global styling.

This way empty paragraphs still produce an empty line.
Not possible to do inline because CSS pseudo classes do not work inline.

Make radio button and first line of the label (in case there is a line 
break) appear at the same height.

This makes it so that other options appear with strikethrough when one 
is selected.

Since this is built using a grid it does not need dimensions. In fact it 
having dimensions interferes with styling.

For elements which don't have this functionality the workaround is to 
use pointer events and make the elements unclickable.

* Add IntersectionService
* Add CompoundElementComponent as parent for LikertComponent
* Inject ElementRef to common ElementComponent
* Rename players' ElementComponent to ElementContainerComponent

This improves bold text readability.
This has to be done in the actual element, in the TextEditor and on the 
properties panel.

Add 10px margin between label and options.

When the label is empty a smaller input field will be rendered which 
also does not have the label placeholder.

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.

Colors and font stuff.