More reporting output

[hpryce]

There is more information available about log4j jars than we're currently presenting before this PR:

• Where there is a JndiLookup class
• If the finding was in what we think is an obfuscated jar

For the latter this builds on top of #36

[hpryce]

Example of new human readable match:

CVE-2021-45046 and CVE-2021-45105 detected in file examples/obfuscated/2.14.1-aaaagb.jar. log4j versions: 2.9.0-2.14.1. Reasons: jar file appeared obfuscated, byte code partially matched known version

Example of new json match format:

{"message":"CVE-2021-45046 and CVE-2021-45105 detected","filePath":"examples/obfuscated/2.14.1-aaaagb.jar","findings":["jarFileObfuscated","classBytecodePartialMatch"],"log4jVersions":["2.9.0-2.14.1"]}

[nmiyake]

Error output is missing trailing newlines, but otherwise looks good -- will approve once PR is updated to fix output.