- 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/Db/Extensions/CustomReactionsExtensions.cs

@@ -7,21 +7,15 @@ namespace NadekoBot.Db;
 public static class CustomReactionsExtensions
 {
     public static int ClearFromGuild(this DbSet<CustomReaction> crs, ulong guildId)
-    {
-        return crs.Delete(x => x.GuildId == guildId);
-    }
+        => crs.Delete(x => x.GuildId == guildId);
 
     public static IEnumerable<CustomReaction> ForId(this DbSet<CustomReaction> crs, ulong id)
-    {
-        return crs
+        => crs
             .AsNoTracking()
             .AsQueryable()
             .Where(x => x.GuildId == id)
             .ToArray();
-    }
 
     public static CustomReaction GetByGuildIdAndInput(this DbSet<CustomReaction> crs, ulong? guildId, string input)
-    {
-        return crs.FirstOrDefault(x => x.GuildId == guildId && x.Trigger.ToUpper() == input);
-    }
+        => crs.FirstOrDefault(x => x.GuildId == guildId && x.Trigger.ToUpper() == input);
 }