Advent of Code Migration from Sir Lancebot

[janine9vn]

This is a migration of the Advent of Code cog, mostly as-is, from Sir Lancebot to Sir Robin. This is as close to a straight migration as I could manage. Any changes or improvements we want will be made in subsequent PRs once this is merged in.

How do I review this?

I've split this up into 4 commits, grouped by collections of files/changes:

• Porting over the necessary utils/ files
• Updating the constants.py file
• A quick port of the invoke help command thingy
• Migration of the Advent of Code cog itself

The commits have information about what is not quite the straight port. Spoiler alert: it's some import statements and parts of the Redis Cache. Everything else is a straight copy/paste or drag/drop.

If you'd like to test this with minimal effort, I can provide most of my .env file that includes the leaderboard session cookie information. I can also provide you access to my test server where it should have the roles and constants configured for my .env file.

[MarkKoz]

I did not intend for my comments to block the merge (given that they were left with an approval). I don't know why GH is blocking. Feel free to resolve them whenever you want to merge this. I assume you're still waiting for env vars to be set in prod?