java.nio.charset.UnsupportedCharsetException: cp65001. Fix proposal.

LOG4J2-2011 replace JCommander command line parser with picocli to let users run Log4j2 utility applications without requiring an external dependency

Revert "[LOG4J2-1990] ConcurrentModificationException logging a parameter of type Map. Another go at it based on Ralph's suggestion."

This reverts commit 68de0ff8.

type Map. Clearer error message. Update to allow
AppenderLoggingException to percolate to the caller when requested with
the ignoreExceptions="false" setting.

Server has been updated.

type Map. Clearer error message.

LOG4J2-1990 refactor #logMessageSafely method to stay within 35 byte MaxInlineSize threshold; add TODO for Configuration setting to propagate exceptions back to caller

type Map. Another go at it based on Ralph's suggestion.

type Map. Another go at it based on Ralph's suggestion.

re-connection to server.

type Map. Catch Exception instead of ConcurrentModificationException as
suggested by Ralph.

minor formatting changes.