Update taxonomy tab with raw data

[rmorse]

Currently the plugin is using a WP function to retrieve taxonomy data associated with a particular post.

This does not account for any malformed taxonomy term data or orphans - we should probably run a SQL query on the terms table to get all the connected terms and if possible, convert the term IDs to labels for better formatting - but still show any orphans etc if they exist in the database - this would keep the behaviour inline with the plugins objective + description, and more closely match the behaviour of the other 2 tabs (post data and meta data).