* Implementation of a KNX platform driver and a KNX switch
* Starting working on a KNX thermostat implementation
* Removed KNX thermostat implementation from this branch again
* Make gateway parameter optional (can be auto-detected in many cases)
* Removed check for double initialisation
* KNX messages now will be handled internally and not send to the Home Assistant message bus
* Call update_ha_state only if should_poll is false
* Removed unused HASS variable
* knxip library version changed
* pylint optimization
