Exit, hibernate, shutdown after downloads finsih

[trimechee]

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• [X] I understand that I will be blocked if I remove or skip any mandatory* field & the issue will not be entertained

Checklist

• [X] I'm requesting a feature unrelated to a specific site
• [X] I've looked through the README
• [X] I've verified that I'm running latest version of ytdl (update instructions) or later (specify commit)
• [X] I've searched the bugtracker for similar issues including closed ones. DO NOT post duplicates

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Hello, It will be great please if there is option "exit" after all downloads finsih, and "hibernate" and "shutdown" option after all download complete because some files are too big and it takes a lot of time to finish downloads ot files which weighs many gigabyte and these options help save battery and energy and ecology....thank you so much !