add: Added .cleanupguilddata command which will delete all guildconfigs, xp stats and other data related to any guild the bot is no longer in. This is a highly destructive and irreversible command.

dev: Added cascade deletes to any tables which have guildconfigs FK, as well as to some other missing places

src/NadekoBot/Db/Models/DelMsgOnCmdChannel.cs

@@ -3,6 +3,8 @@ namespace NadekoBot.Db.Models;
 
 public class DelMsgOnCmdChannel : DbEntity
 {
+    public int GuildConfigId { get; set; }
+
     public ulong ChannelId { get; set; }
     public bool State { get; set; }