strip_heredoc() public

Strips indentation in heredocs.

For example in

if options[:usage] puts <<-USAGE.strip_heredoc This command does such and such. Supported options are: -h This message ...  USAGE end

the user would see the usage message aligned against the left margin.

Technically, it looks for the least indented non-empty line in the whole string, and removes that amount of leading whitespace.

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