Perform the persistence asynchronously to not block the main (UI) thread #69
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This avoids "your app is not responding" errors, while the git command is waiting for password input to load the gpg key for commit signing.
This also reverts the fix from 7cc0463: Calling System#exit immediately after Platform#exit prevents Application#stop from being called. And we always exited with 0. Now the exit status is determined by DesignerStarter#launchGui and used correctly. Platform#exit triggers the shutdown of JavaFx. After that is done execution continues in DesignerStarter after Application#launch.