rm BatteryVis, Added header components, tweaks
Removed: - Battery Visualizer -> Too much real estate taken, not so useful, device battery visible in main header and overview panel. - Dash Separator -> Useless - Growing text -> Relic from early testing days - Header -> Replaced by `main_header` and `main_footer`. Added: - Documentation - Main header components (battery and db, WIP: map and network) - Main footer - Locations of interest database (and related data classes). Changed: - DataHandler (WIP, remove reliance on latest packet, use database) - Renamed DatabaseHandler to MainDatabaseHandler (only storing LogAir device data). - Tweaks in overview widgets to remove tree clutter.
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