- More code cleanup and codestyle updates

- Fixed some possible nullref exceptions
- Methods signatures now have up to 3 parameters before breakaing down each parameter in a separate line
- Method invocations have the same rule, except the first parameter will be in the same line as the invocation to prevent some ugliness when passing lambas as arguments
- Applied many more codestyles
- Extensions folder fully reformatted

src/NadekoBot/_Extensions/UserExtensions.cs

@@ -0,0 +1,40 @@
+using NadekoBot.Db.Models;
+
+namespace NadekoBot.Extensions;
+
+public static class UserExtensions
+{
+    public static async Task<IUserMessage> EmbedAsync(this IUser user, IEmbedBuilder embed, string msg = "")
+    {
+        var ch = await user.CreateDMChannelAsync();
+        return await ch.EmbedAsync(embed, msg);
+    }
+
+    public static async Task<IUserMessage> SendAsync(this IUser user, SmartText text, bool sanitizeAll = false)
+    {
+        var ch = await user.CreateDMChannelAsync();
+        return await ch.SendAsync(text, sanitizeAll);
+    }
+
+    public static async Task<IUserMessage> SendConfirmAsync(this IUser user, IEmbedBuilderService eb, string text)
+        => await user.SendMessageAsync("", embed: eb.Create().WithOkColor().WithDescription(text).Build());
+
+    public static async Task<IUserMessage> SendErrorAsync(this IUser user, IEmbedBuilderService eb, string error)
+        => await user.SendMessageAsync("", embed: eb.Create().WithErrorColor().WithDescription(error).Build());
+
+    public static async Task<IUserMessage> SendPendingAsync(this IUser user, IEmbedBuilderService eb, string message)
+        => await user.SendMessageAsync("", embed: eb.Create().WithPendingColor().WithDescription(message).Build());
+
+    // This method is used by everything that fetches the avatar from a user
+    public static Uri RealAvatarUrl(this IUser usr, ushort size = 256)
+        => usr.AvatarId is null ? new(usr.GetDefaultAvatarUrl()) : new Uri(usr.GetAvatarUrl(ImageFormat.Auto, size));
+
+    // This method is only used for the xp card
+    public static Uri RealAvatarUrl(this DiscordUser usr)
+        => usr.AvatarId is null
+            ? null
+            : new Uri(usr.AvatarId.StartsWith("a_", StringComparison.InvariantCulture)
+                ? $"{DiscordConfig.CDNUrl}avatars/{usr.UserId}/{usr.AvatarId}.gif"
+                : $"{DiscordConfig.CDNUrl}avatars/{usr.UserId}/{usr.AvatarId}.png"
+            );
+}