CA certificate via mDNS: Split at certificate lines instead of fixed length; don't include newline characters

Part B:

The TXT record MUST contain the certificate where each line is stored separately [...]

The current implementation does not store lines separately, but splits the content after 128 characters (source).

Part B is not yet clear about if the line separators should be included or not. But Georg (original author of this section) clarified that the lines are intended to be stored without the trailing line separators. This will probably be specified in Part B soon.

(The PEM encoding specifies that the Base64-encoded certificate content must be split after each 64 characters, so "line" is clearly defined. See also RFC 1421 and RFC 7468.)