- Added a simple bank system. Users can deposit, withdraw and check the balance of their currency in the bank.

- Users can't check other user's bank balances.
- Added a button on a .$ command which, when clicked, sends you a message with your bank balance that only you can see.
- Updated pagination, it now uses buttons instead of reactions
- using .h <command group> (atm only .bank is a proper group) will list commands with their descriptions in that group

src/NadekoBot/Modules/Help/Help.cs

@@ -266,6 +266,20 @@ public partial class Help : NadekoModule<HelpService>
         await ctx.Channel.EmbedAsync(embed);
     }
 
+    private async Task Group(ModuleInfo group)
+    {
+        var eb = _eb.Create(ctx)
+                    .WithTitle(GetText(strs.cmd_group_commands(group.Name)))
+                    .WithOkColor();
+
+        foreach (var cmd in group.Commands)
+        {
+            eb.AddField(prefix + cmd.Aliases.First(), cmd.RealSummary(_strings, _medusae, Culture, prefix));
+        }
+
+        await ctx.Channel.EmbedAsync(eb);
+    }
+
     [Cmd]
     [Priority(0)]
     public async partial Task H([Leftover] string fail)
@@ -278,6 +292,20 @@ public partial class Help : NadekoModule<HelpService>
             return;
         }
 
+        if (fail.StartsWith(prefix))
+            fail = fail.Substring(prefix.Length);
+        
+        var group = _cmds.Modules
+                         .SelectMany(x => x.Submodules)
+                         .Where(x => !string.IsNullOrWhiteSpace(x.Group))
+                         .FirstOrDefault(x => x.Group.Equals(fail, StringComparison.InvariantCultureIgnoreCase));
+
+        if (group is not null)
+        {
+            await Group(group);
+            return;
+        }
+
         await ReplyErrorLocalizedAsync(strs.command_not_found);
     }