Header Unfolding & SetAddressList formatting #6
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Add UnfoldedValue() method that returns the unfolded version of a header value.
mail.ParseAddressList cannot handle folded header values so the AddressList() methods would return errors for perfectly valid address lists (that had newlines in them).
While we are at it, we also change the formatting of address lists to encode them as multi-line header fields (one address per line).