JSON-based config with C/Shell-style comments, verbatim sections and variable substitutions

Changes for 0.10

• Scripts for command-line functionality are provided: configjson2json.pl configjson2perl.pl configjson2.yaml.pl Dependency 'Data::Roundtrip' must now have minimum version of 0.16 because prior to that json2perl() was die'ing on failure as opposed to returning undef which is what we expected in the tests.