- 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/Modules/Xp/Club.cs

@@ -10,9 +10,7 @@ public partial class Xp
         private readonly XpService _xps;
 
         public Club(XpService xps)
-        {
-            _xps = xps;
-        }
+            => _xps = xps;
 
         [NadekoCommand, Aliases]
         public async Task ClubTransfer([Leftover] IUser newOwner)

src/NadekoBot/Modules/Xp/Common/XpTemplate.cs

@@ -283,12 +283,8 @@ public enum XpTemplateDirection
 public class XpRgba32Converter : JsonConverter<Rgba32>
 {
     public override Rgba32 ReadJson(JsonReader reader, Type objectType, Rgba32 existingValue, bool hasExistingValue, JsonSerializer serializer)
-    {
-        return SixLabors.ImageSharp.Color.ParseHex(reader.Value?.ToString());
-    }
+        => SixLabors.ImageSharp.Color.ParseHex(reader.Value?.ToString());
 
     public override void WriteJson(JsonWriter writer, Rgba32 value, JsonSerializer serializer)
-    {
-        writer.WriteValue(value.ToHex().ToLowerInvariant());
-    }
+        => writer.WriteValue(value.ToHex().ToLowerInvariant());
 }

src/NadekoBot/Modules/Xp/Services/UserCacheItem.cs

@@ -8,12 +8,8 @@ public class UserCacheItem
     public int XpAmount { get; set; }
 
     public override int GetHashCode()
-    {
-        return User.GetHashCode();
-    }
+        => User.GetHashCode();
 
     public override bool Equals(object obj)
-    {
-        return obj is UserCacheItem uci && uci.User == User;
-    }
+        => obj is UserCacheItem uci && uci.User == User;
 }

src/NadekoBot/Modules/Xp/Services/XpService.cs

@@ -1,4 +1,3 @@
-using NadekoBot.Common.Collections;
 using NadekoBot.Db.Models;
 using Newtonsoft.Json;
 using SixLabors.Fonts;
@@ -312,9 +311,7 @@ public class XpService : INService
     }
 
     public void ReloadXpTemplate()
-    {
-        _pubSub.Pub(_xpTemplateReloadKey, true);
-    }
+        => _pubSub.Pub(_xpTemplateReloadKey, true);
 
     public void SetCurrencyReward(ulong guildId, int level, int amount)
     {
@@ -527,14 +524,10 @@ public class XpService : INService
     }
 
     private bool ShouldTrackVoiceChannel(SocketVoiceChannel channel)
-    {
-        return channel.Users.Where(UserParticipatingInVoiceChannel).Take(2).Count() >= 2;
-    }
+        => channel.Users.Where(UserParticipatingInVoiceChannel).Take(2).Count() >= 2;
 
     private bool UserParticipatingInVoiceChannel(SocketGuildUser user)
-    {
-        return !user.IsDeafened && !user.IsMuted && !user.IsSelfDeafened && !user.IsSelfMuted;
-    }
+        => !user.IsDeafened && !user.IsMuted && !user.IsSelfDeafened && !user.IsSelfMuted;
 
     private void UserJoinedVoiceChannel(SocketGuildUser user)
     {
@@ -650,9 +643,7 @@ public class XpService : INService
     }
 
     public bool IsServerExcluded(ulong id)
-    {
-        return _excludedServers.Contains(id);
-    }
+        => _excludedServers.Contains(id);
 
     public IEnumerable<ulong> GetExcludedRoles(ulong id)
     {

src/NadekoBot/Modules/Xp/Xp.cs

@@ -51,7 +51,7 @@ public partial class Xp : NadekoModule<XpService>
     {
         page--;
 
-        if (page < 0 || page > 100)
+        if (page is < 0 or > 100)
             return Task.CompletedTask;
 
         var allRewards = _service.GetRoleRewards(ctx.Guild.Id)