Fixed - task 429: [feature] replace pojo serialization to db with json 
https://github.com/asksven/BetterBatteryStats/issues/issue/429
Added unit tests
Fixed - task 446: [Bug] notification of watchdog shall never show more
than 100% 
https://github.com/asksven/BetterBatteryStats/issues/issue/446
Fixed - task 443: [feature] avoid root for alarms 
https://github.com/asksven/BetterBatteryStats/issues/issue/443
Merge branch 'dev-1.16' of github.com:asksven/BetterBatteryStats into dev-1.16