It's still very much possible to leak the descriptor (when an exception occurs
somewhere in between or anything else goes wrong). So maybe the whole thing
should be redesigned to be independent of files.
- model package contains mostly shared interfaces (UI+service), not named GB*
- impl package contains implementations of those interfaces, named GB*
the impl classes should not be used by the service (not completely done)
- the service classes should mostly use classes inside the service and deviceevents
packages (tbd)
Every device now has two packages:
- devices/[device name] for UI related functionality
- service[device name] for lowlevel communication
