[Repository] Show item descriptor default values

[onewingedfallen59]

[Repository] Show item descriptor default values

[onewingedfallen59]

I've been working on this feature recently. I'll commit a first version soon.

However, there is performance impact so I think I'll make it disabled by default and configurable like the autocomplete feature.

I show default values for the itemDescriptor but without search for any inherited default values. I'll work on that in a future version.