timer now is updated and scheduled withoud need to relaunch the app. timer interval is read from settings
fixed tests. added test to check timer update being set
added new class: TimerStatistics - to track app data and everything else related to timer. Correcly plotting average battery level
added tracking of how long the app is running. setting this on menu item 8
fixed average calculation and plotting.
set dashed line for average value for battery
changed created by line
formatting time output to show how long app is running. h/m/s
trying to clear log data while app is running