fix redirect_output decorator; remove ninja code

- Lots of instance of `for c in ...` or `for a in ...` or `fmt` which are non-descriptive and sometimes cryptic.

- Ves suggested running the command in an asyncio task for `@redirect_output`, rather than making a workaround which only applies to the help command. This fixes a fundamental flaw where the redirection message wouldn't be deleted until a further 60sec after the command has finished, which for `!help` could be up to 5min, meaning the invocation message could be sitting there for 6min, not the intended 60sec.

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