* Temporarily disable data file writing as it can cause crashs, see https://github.com/jomjol/AI-on-the-edge-device/issues/1225
* removed edit function in graph as we don't need that in a release
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* improve log viewer
* replaced logfile enable/disable with enum to select log level. At least errors always will be logged (as before)
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* colorize log
* scroll down
* improve log reload