Multiple features and fixes.

Moved contents from VictimsRecord to be the Artifact class.
Added new implementation of VictimsRecord corresponding to DB v2 schema.
Using gson to convert input json to VictimsRecord
Implemented conversion for Artifacts to VictimsRecord
Few minor bugfixes
Added new methods exposing objects from Artifacts more cleanly
Changed metadata for ArchiveFile to be an ArrayList instead of hashmap
Removed debug main methods
Removed Constants Enum in favor of fingerprint.Key and
fingerprint.Algorithms