With changes to config, the converter from V2 data is no longer safe for use. (see #2545, #2550, #2551, #2536)for the final nails in the coffin, was already unsafe for use with large datasets)

This can be rewritten at a later date more up to date with newer methods of doing things in Config, but the current version is broken in multiple ways.

1. It attempts to write each entry individually: This will disconnect some bots currently with a blocked heartbeat. This cannot be fixed by context switching between writes without the potential for data loss.
2. It has no awareness of the new custom groups, and cannot have that awareness without a large re-design.
3. The inner workings of it were written hastily, and while they are correct in the transformative process, they are not readily maintainable.

1 & 3 are failings on my part, 2 is a result of changes unforeseen at the time.

This removes the cog and related util, and leaves the door open to anyone wishing to rewrite this up to our current code standards.

End users can still convert data so long as they do so prior to the 3.1 release, but I'd suggest leaving the v2 data behind from here.