1.7.0b2 - Segments and Substream

Changes and new Features

• Installs tzdata package. Closes #55
• A new config option, thumbnail is available under recorder.
  Use this to send a snapshot of the detection that triggered a recording to MQTT, or choose to save to disk

Fixes

• Fixes segments process not starting when using substream

Docker images are available on Docker Hub
roflcoopter/viseron:1.7.0b2
roflcoopter/viseron-cuda:1.7.0b2
roflcoopter/viseron-vaapi:1.7.0b2
roflcoopter/viseron-rpi:1.7.0b2