Add case_id to mutes. Add !mutes command to list mutes.

src/models/Mute.ts

@@ -3,6 +3,7 @@ import Model from "./Model";
 export default class Mute extends Model {
   public guild_id: string;
   public user_id: string;
+  public case_id: number;
   public created_at: string;
   public expires_at: string;
 }