Version 1.6

• Add Lock, Water Valve, and Relay virtual devices. Note that lock has a separate service for Target and Status from all other binary on/off devices — it does not use urn:upnp-org:serviceId:SwitchPower1, but rather urn:micasaverde-com:serviceId:DoorLock1.
• Make post-timer return state configurable via TimerResetState; this enables TriState virtual switches to return to off or void.