Adding elements from portal

[cherry13579]

It should be recognizable which element has already been added
Change the add content icon so that it does not resemble the ArcGIS Toolbox .
It should be possible to mark portal items as favorites in the portal from the portalitemloader interface without having to switch to the portal.
It should be possible to remove content added via the portalitemloader from the portalitemloader interface via a tooltip from the active map.
Provide the jump button to the portal interface with a mouse over that displays “Details”
Remove the display of how often the item has been accessed (eye).

Add information about which item is marked as reliable:
Reliable: tick green
Nothing assigned: nothing
Obsolete: red circle symbol