Additions and changes (mostly) related to Swepub and auto-classification

[niklasl]

WIP (to be discussed):

• [x] Add SoftwareAgent class (To differentiate between a process and its used software or service. (GenerationProcess is a conflation between the two; and a subclass of AdminMetadata. We may want to improve this across the platform.))
• [x] Update SSIF generation script.