The best way of not getting something wrong is to not require it in the first
place...
All plugins now use DeviceInstanceId-style quirk matches and we can just drop
the prefix in all files. We were treating HwId=, Guid= and DeviceInstanceId= in
exactly the same way -- they're just converted to GUIDs when building the silo!
This makes perfect sense, because the 'initiator' starts the transaction and
the 'target' is the addressee of the transaction. Even the I²C spec defines the
'master' as 'initiating' the transaction.
This is the same nomenclature now used by the Glasgow project too.
