Provide more abstractions in BLAST node

[derwehr]

Similiar to createThing method, which creates ConsumedThing instances from TDs and Bluetooth mac addresses or HID paths, we should look into creating more abstractions to ease the usage of WoT devices in BLAST node.

(@FreuMi: "If I could do WoT operations, that usually take me 5 mins to code, in 1 min with BLAST, I'd use it")

[aharth]

For example include Zhou's and Daniel S.' discovery based on asset descriptions in RDF towards an asset management component.