added DHT, restart after OTA

• ESP.Restart() after OTA update
• added DHT_unified for Temp/Hum sensor

non-blocking MQTT, ArduinoOTA, settable hostname

• added publish of own IP
• added real non blocking mqtt connection
• added ArduinoOTA
• wifi hostname will be set to mqtt client id

Initial release with basic functionality

0.0.1

closes #2