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Night skybox

This will change the skybox to night.
There will be stars (obviously) and it's dark.
To undo this simply remove it with the remover or undo (default "Z"). You can also clean it up by going to the "menu"
(default "Q") > Selecting "Utilities" instead of tools at the top right > Cleanup (user is for what you made. Admin cleans up everything at the server) > Select "Duplicates" (clean up everything works aswell).
Done.