notification that restart is needed for change to take effect

[MarnixCroes]

Please describe the feature you'd like to see added.

When changing a setting, like enabling RPC, the app needs to be restarted for it to come into effect.
Thus having a notification that restart is needed should be there to let the user know.

qt gui has this.

Is your feature related to a problem, if so please describe it.

No response

Describe the solution you'd like

some text pop up telling that a restart is needed.

(maybe later an actual restart button could be added too, so it's not only the text but clicking the button will restart)

Describe any alternatives you've considered

No response

Please leave any additional context

No response