Werk #3646: Fixed Livestatus output formats

All Livestatus output formats handle special characters correctly now, including non-ASCII characters, quotes, and backslashes.

There is one exception: To avoid compatibility problems, the default csv format has been left unchanged and is still broken. A new format CSV (note the uppercase) has been added which is fully functional and therefore ignores the Separators: header/hack.

Furthermore, a new python3 format has been added to handle the changed default string type in Python 3, where bytestrings and Unicode strings have basically swapped their roles.

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