1.6.4

• Using System.Text.Json instead of Newtonsoft. This gets us a little more speed.
• No more formatting, I had left it indented for ease of debugging, but that period has past.
• Increased max depth count to something that won't break stack, but is also higher than we would expect to get in Maven (1024).
• Added reference preservation to cache file. No longer will duplicate objects be emitted repeatidly. DependencyNodes and Artifacts and Dependencies will be referenced with $id and $ref. Shortens the JSON file.