dm4-webclient: improve finding and selecting specific items in listings

[Malte]

In a real world usage scenario i sometimes have trouble finding an item in a (potentially long) listing on the right side of the screen, in example:

• when i search for "Ben Shneiderman" after i selected the Topic Type "Person", being able to filter this listing by name/text (otherwise i must read through all entries) interactively could speed up retrieval

• in one workspace scenario i (acaemdics) i would prefer to sort all such entries (e.g. Persons by their surname instead of forename) while in another usage context e.g. writing a mail and skimming through my personal contacts i would prefer entries sorted by (forename instead of surname)

• Furthermore it would come hand to sort all items in such lists by their "last modified" or "creation" timestamp, just to have recently edited items a top of the listing.

With "listings" i mostly refer to those shown in the "What's related"-area (e.g. associated topics) but also those shown when there are many "Child Topics" (e.g. search results).

Just wanted to let you know about this, imo this could improve users life with the dm4-webclient. Cheers!