New Metadata Edit: Bug and improvement list

[geofranzi]

---found by @FelixUniJena

• checkbox instead of toogle for bool (would be easier to use)
• required complex types should not have a trash icon and missing the collapse / exapnd icon
• placeholder text on top not readable
• collapse / expand remove validation store, but should not
• collapse / expand should not trigger if not added to tree (+ shown)
• Test XML Notification Center: Email Notification vis
• Test XML Katalog with Attributes: from 2nd Pruct the preis is 0
• Test XML Number fields: Ganzzahl erlaubt 1.5, Nicht negativ erlaubt negativ, dezimal button is in int, ...
• Test XML List with max 2 allows more entries to select
• Show description for all fields (even if empty)
• long title break saving (error)
• terminilogy ui component not render on first level
• array title was not correct