Implemented entities for storage of persistent data:
Placements
ConnectionSettings
ThingSettings
Implemented corresponding tables, set up object-relational mapping, updated implementation of corresponding system components to use new DB-based configuration format for Things, Placement and Connections. And added a configuration migration script
Implemented entities for storage of persistent data:
Implemented corresponding tables, set up object-relational mapping, updated implementation of corresponding system components to use new DB-based configuration format for Things, Placement and Connections. And added a configuration migration script
Closes #30