* [CHD-2711] [Mail/Relay/Comments] When a worker is replying to a relayed message from an external email account, the '#comment' tag will now allow comments to span multiple lines.  The comment will be terminated when it encounters a blank line or a line starting with another #tag.  This was necessary because some email applications, like Gmail, force text/plain content to hard wrap on spaces before 76 characters, and quoted-printable encoding isn't used to preserve the original wrapping.  The comment will still appear as a single paragraph in Cerb.
* [CHD-2711] [Mail/Relay/Comments] A new '#start comment' tag is available to workers that respond to relayed messages through an external email account.  This allows multiple line comments where linefeeds will be preserved.  This is especially useful for chunks of formatted text like code fragments and patches.  A multiple line comment is terminated with an '#end' tag on its own line.  If a worker's mail application adds hard linefeeds to their comment content, those will be preserved in the comment created by Cerb.