Reworked advent of code. (#183)

* Reworked advent of code.

Refreshed all of advent of code to work with the new slash commands.
This includes:
 - Adding a database to record AOC accounts and discord users
 - Adding a database to record previous winners
 - Reworking the command to select winners
 - Reworking the leaderboard display system

* Added detail to advent help menu

* Added weights to advent help menu

* Used the proper discord mention property and refactored a little

* Minor style changes

* Refactored AOC into a utils file

* Small style changes for black

* Fixed autoincrement for the SQL database

* Removed ids from registration db & removed advent from pyright exception list

* Removed type-checking machinery

pyproject.toml

@@ -41,7 +41,6 @@ build-backend = "poetry.core.masonry.api"
 [tool.pyright]
 strict = ["**"]
 exclude = [
-    "**/advent.py",
     "**/bot.py",
     "**/error_handler.py",
     "**/events.py",