Red background looks really bad, so we just adjust the border color.

- remove ID handling from model classes. This is now done by the editor 
itself (mainly unit service).
- Rename and move IDManager to editor as IDService

Just called from the editor, before creating the Unit instance.
It goes through all IDs and checks for duplicates. If found it generates 
a new one and shows the prompt.

Transform string array to Textlabel array.

#338

i.e. something has been clicked.
Since the value is not used on the player, we also need to check the 
FormControl value.

#335

had some issues with the switch to the new options stuff.

When calling the element constructor may generate IDs. Those appear as 
already registed later when the unit is instantiated for real.

- Do ID checks only in the class, not in unit service (or elsewhere)
- Fix repaired value list to get new objects instead of references to 
the existing.

There should never be the case, therefore error out.

Use map and flat instead of reduce to set dragNDropValueObjects

- Use Unit's getAllElements method of Unit instead of
UnitUtils.findUIElements to get all DragNDropValueObjects
in UnitComponent
-Remove unnecessary timeout in UnitComponent

- Sanitize without using unit definition version

- This makes the behavior identical to real form elements
- To trigger the focusout event, the HTML element needs
the tabindex attribute

simple dropdown lists need a minimum height so they don't collapse
if they don't contain any element