v0.0.6

Add simple motion detection engine (NB: changed engine selection option in settings json)
Add tweakable video writer codec (useful on low-end systems)
Uncomment some more objects to detect with OpenCV
Add uptime to status
Add notification on app start
Add detected objects classes to alarm description
Add preview_sampling_interval_ms option to settings.json to configure previews from config
Fixes related to linux
Bugfixes and tweaks