Version 0.3 (development snapshot)

Major changes (probably breaking)

• Rework of subscription system (asynchronous publishing, _publish is no coroutine anymore, origin clearing for state consistency)
• Interfaces' wait() method dropped
• persistence module renamed to log and completely refactored

Other major changes

• New SHC websockt client interface
• New MQTT & Tasmota interfaces
• New web UI widgets for logging
• New helper classes (e.g. Hysteresis, TimerSwitch, BreakableSubscription)

… and many, many minor changes and fixes