Encoding with quoted-printable produces an extra CR character

[dalibor]

>> p Mail.new(Mail.new(body: "®\n123\n123\n123").encoded).decoded
=> "®\r\n123\r\n123\r\n123"

(® is used to trigger quoted-printable encoding)

I believe we should revert #1208. ::Mail::Utilities.to_crlf should only be used with raw_source= i.e. when we're parsing an email (Mail.new(content)) and not when we're creating an email by specifying the body content Mail.new(body: body). I think all the problems around CR LF are because we're not distinguishing between creating and parsing emails.

[jeremy]

Fixed by #1210