- remove `shared` package and shared.Message
- rename `notifications` package to `frontend`
- introduce a channel send the received ServerMessages to the frontend handler(s)
- move keyhandler to goroutine
- simplify password handling in Start function
- update import names when importing from GoTomoto
- add helper function to parse configuration from a YAML file
- update command-line parameters to include a config file option
- remove hardcoded Pomodoro settings and use parsed config instead
- delete obsolete PomodoroSettings.go file
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