Change item creation form

[mkrzmr]

related to #179

With the change in recommended/optional metadata fields, change the item creation form accordingly so that only recommended fields are selected.

Move "Version", which is hardly used and optional, down to the other properties

For all item types except Workflows, make accessibleAt mandatory to complete the form and submit the entry

[laureD19]

• 1 for the necessity to update the edit forms based on the new list of recommended metadata fields, including "downgrading" the version field in the edit forms.

However, for the latest point mentioned above - "make accessibleAt mandatory" - this was extensively discussed during the development phase of the MP and would require changes to the data model as well as in backend. With our current metadata population, it would also create a lot of bugs as we still have a bunch of items without "accessibleAt" but already in the system. So, even if this point has been spotted as an important one for future upgrade of the data model, I don't think we should implement it now. I would recommend instead to list it as a potential new requirement for the next MP upgrade.

[laureD19]

after discussion, agreement on making accessibleAt mandatory.
Still, the rest of the recommended fields + downgrading version should be updated in the edit forms.