Framework V2.2.5: Rework of 12V reference logic
- Filters out single peaks / misreadings
- Sends "OK" alerts if voltage level restores w/o charging
- 15 minutes calmdown before taking new ref voltage
- No alerts while car is on

Twizy V2.6.3:
- Bug fix and acceleration of battery monitor sensor fetching
Merge branch 'master' of https://github.com/markwj/Open-Vehicle-Monitoring-System.git