* Change chart history to one day based on some devices having less history.(thanks michael.hufer@gmx.de)
* Have charts min/max be based on actual data received instead of hard coded values.(thanks michael.hufer@gmx.de)

Update packaging and use KF5 for about screen. Implement basic notifications for error messages. Use icon for app icon.

Made large progress on getting history from device.

Implement class that talks to BLE miflora devices.
Have UI show current values from new class.