Identification
Image transfer
Imaging
Automatically ReleaseDevice when application disconnects from bus
Rethink print handling - we discover on ListEnrolled and rediscover on each LoadPrintData

Enforce command sequences:
 force VerifyStop after non-retry verify result comes in
 only allow GetVerifyResult during a verification
 only allow VerifyStop during a verification
 etc


- Check whether we actually want claim to open the device, or allow
  some operations to not require claiming the device