Add support for a generic set of VO2 measurements:
* Respiratory Frequency
* Respiratory Minute Volume aka Ventilation
* Volume O2 consumed
* Volume CO2 produced
* Tidal Volume
* FeO2 (Fraction of O2 expired)
* Respiratory Exchange Rate (calculated as VCO2/VO2)
Make the new metrics usable in TrainView, and store VO2 data as XDATA
using the same pattern as for HRV data.
Add support for VM Pro by VO2Masters
The VM Pro is a BLE device, so support is added in the BT40Device class.
Since the device requires some configuration in order to be usable, such
as the size of the "User Piece" a special configuration widget is added
and shown in a separate window when the device is connected.
This window is also used to set a number of useful settings in the
device, and to show calibration progress. There's also a detailed log of
the status messages shown, and this can also be saved to file.
Allow notifications from RealtimeControllers and devices in the
notification area of Train View. In order for devices to display
information in the notification field in TrainBottom the signals need
to added and propagated from from device level via RealtimeController
to TrainSidebar and finally TrainBottom.
Fix an issue with multiple BT40Device per actual device
Currently on MacOS there will be multiple BT40Device per actual device,
since the QBluetoothDeviceDiscoveryAgent::deviceDiscovered() signal is
emitted multiple times with e.g. updated RSSI values. Avoid this by
checking the previously created devices first.
MacOS doesn't disclose the address, so QBluetoothDeviceInfo::address()
can't be used there, instead deviceUuid() is used which is instead only
valid on MacOS.
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