Improve Entity display

Within ITI use-cases there seems to be a need for a middle ground between the basic EntityItem with just Entity.label and a fully implemented EntityType-specific EntityItem: a EntityItem containing a link/url that would point to an external site where the Entity is further described.

I imagine an implementation to change the part where the used EntityItem i decided to work as follows:

1. Check Entity.types array for matches for a custom type-specific EntityItem Component
2. If nothing was found, check if Entity.details optional property exists. If it exists, use DetailsAwareEntityItem (name tbd) that then could itself check for availability of details.url or details.description and other supported properties and handle them.
3. If no details were provided, use current EntityItem component

This keeps the Entity schema clean and unchanged and lets the current EntityItem component be as primitive as it is while allowing for additional likely props without the need to create many additional EntityTypes.

It would also enable access to extensive Entity details where in-application display (and thus a custom type-specific EntityItem) is not needed.