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Preparse the arguments to error out early when needed

Jeremy Soller requested to merge AyeTbk:some_sleep_fixes into master

Created by: AyeTbk

sleep.rs parses it's arguments and waits the according time sequentially, in a way that if an invalid time interval appears after valid time intervals, it errors out during execution. For exemple, currently, the command

sleep 1m redox 30s

will wait 1 minute then exit with an error saying 'redox' is not a valid interval.

This PR makes it so sleep.rs parses all it's arguments first, errors out if needed, and only then starts waiting.

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