add: notify, minesweeper, migrations

dev: renames, refactors
change: remind optimized wait

src/NadekoBot/Db/Models/xp/UserXpStats.cs

@@ -6,6 +6,4 @@ public class UserXpStats : DbEntity
     public ulong UserId { get; set; }
     public ulong GuildId { get; set; }
     public long Xp { get; set; }
-    public long AwardedXp { get; set; }
-    public XpNotificationLocation NotifyOnLevelUp { get; set; }
 }