Since the latest update I collected a lot of "materials" and "data".
I found materials after destroying a ship and they often consisted of former parts of the ship, e.g. shield emitters or hull alloys.
Data was collected when I scanned other ships and in one case by finding a data beacon after following an Unidentified Signal Source.
These materials and data don't use any cargo space, but I don't know what to do with them. Selecting them in my inventory displays a message regarding engineers, but I haven't found any yet.
Where do I find engineers? What can they do with these materials/data?
If I don't want to give them my materials/data, can I sell them?