* Simpler handling of true and false in best effort JSON formatter
* inet:ntoa/1 to format IP addresses
* Made a record for lazy formatted trace values and formatter to improve
maintainability
* Added callback to format return value from connector
* Extended test case to check that the format return value callback
works
* Added handling of "lazy" trace entry data to the text formatter. Do we
need to handle this data in the normal log formatters as well?
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