Make use of discord.py's bot/cog extensions

[perrycate]

Discord.py has a lot of useful features that I'm not taking advantage of yet: https://discordpy.readthedocs.io/en/latest/ext/commands/index.html

From a learning standpoint it makes sense for me to start small, but as(/if?) this project grows I'll eventually need to start taking full advantage of the library to avoid reinventing the wheel.

[perrycate]

Looks like it'll be awhile before cogs become useful, but I could switch to using the commands stuff whenever without too much work. Still, until the boilerplate from working at a lower-level gets annoying (or hard-to-fix bugs that are already handled by the commands library show up), I don't think it's worth switching just yet.