Add "display-off" mode to ECG App
It would be cool if the ECG app had a mode where the display and LEDs are turned off to do long (passive) measurements.
The following discussion from !296 (merged) should be addressed:
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@griffon started a discussion: (+1 comment) In theory we could add more modes. Like display backlight off for power safe during logging. But in theorey i would prefer to have powersafe features in epicardium rather then the app.