Refactor the main renderer

[danielbeeke]

The main renderer has problems:

• It is hard to inspect the scores given by the algo's for the dash:editors
• The data is injected in a later phase which makes it hard to give a specific widget for an RDF object hat does not match the SHACL property datatype.
• It is hard to create empty values for he widgets in nested situations. In the current state empty values are generated when a widget is displayed. If this structure is needed, it should be in a phase before rendering and not in the rendering phase.
• It is quite complex with all the data shown

It would be great to find a better way to do these.