Parse "Site Characteristics Database" LevelDB

[obsidianforensics]

Parse "Site Characteristics Database" LevelDB. This database tracks high-level things about a site, such as if it changes the page's title in the background. Records may contain multiple timestamps.

Features in this PR:

• Includes parsing of deleted records
• Records often persist longer than URL History records and can be used to indicate a past visit to a particular site
• The records are keyed by the MD5 hash of site's origin (ex: dfir.blog or www.google.com)
• Added function to hash all seen origins in browser artifacts and translate MD5->Origin where possible