Removed module projects because it can't work like that atm. Commented out package commands.

NadekoBot.Core/Modules/Utility/Services/VerboseErrorsService.cs

@@ -0,0 +1,86 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Discord;
+using Discord.Commands;
+using NadekoBot.Common.Collections;
+using NadekoBot.Extensions;
+using NadekoBot.Modules.Help.Services;
+using NadekoBot.Core.Services;
+using NadekoBot.Core.Services.Database.Models;
+
+namespace NadekoBot.Modules.Utility.Services
+{
+    public class VerboseErrorsService : INService, IUnloadableService
+    {
+        private readonly ConcurrentHashSet<ulong> guildsEnabled;
+        private readonly DbService _db;
+        private readonly CommandHandler _ch;
+        private readonly HelpService _hs;
+
+        public VerboseErrorsService(NadekoBot bot, DbService db, CommandHandler ch, HelpService hs)
+        {
+            _db = db;
+            _ch = ch;
+            _hs = hs;
+
+            _ch.CommandErrored += LogVerboseError;
+
+            guildsEnabled = new ConcurrentHashSet<ulong>(bot
+                .AllGuildConfigs
+                .Where(x => x.VerboseErrors)
+                .Select(x => x.GuildId));
+        }
+
+        public Task Unload()
+        {
+            _ch.CommandErrored -= LogVerboseError;
+            return Task.CompletedTask;
+        }
+
+        private async Task LogVerboseError(CommandInfo cmd, ITextChannel channel, string reason)
+        {
+            if (channel == null || !guildsEnabled.Contains(channel.GuildId))
+                return;
+
+            try
+            {
+                var embed = _hs.GetCommandHelp(cmd, channel.Guild)
+                    .WithTitle("Command Error")
+                    .WithDescription(reason)
+                    .WithErrorColor();
+
+                await channel.EmbedAsync(embed).ConfigureAwait(false);
+            }
+            catch
+            {
+                //ignore
+            }
+        }
+
+        public bool ToggleVerboseErrors(ulong guildId)
+        {
+            bool enabled;
+            using (var uow = _db.UnitOfWork)
+            {
+                var gc = uow.GuildConfigs.For(guildId, set => set);
+
+                enabled = gc.VerboseErrors = !gc.VerboseErrors;
+
+                uow.Complete();
+
+                if (gc.VerboseErrors)
+                    guildsEnabled.Add(guildId);
+                else
+                    guildsEnabled.TryRemove(guildId);
+            }
+
+            if (enabled)
+                guildsEnabled.Add(guildId);
+            else
+                guildsEnabled.TryRemove(guildId);
+
+            return enabled;            
+        }
+    }
+}