Determine what tables are needed for the Music features

[tgoins]

No description provided.

[brandonbothell]

We'll probably need to have a role ID in the guild settings for DJs, and a way to set that with the bot. We'll also need to have a boolean that determines whether or not the guild has the option enabled to only let DJs skip music and clear the queue. Not sure we'll need anything else, because if we want the queue to persist through bot restarts we can just use Redis.

Actually, we may also need a boolean for whether or not a guild is banned from using music features. Same thing for users.