- 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/Nsfw/SearchImagesService.cs

@@ -53,9 +53,7 @@ public class SearchImagesService : ISearchImagesService, INService
     }
 
     private Task<UrlReply> GetNsfwImageAsync(ulong? guildId, bool forceExplicit, string[] tags, Booru dapi, CancellationToken cancel = default)
-    {
-        return GetNsfwImageAsync(guildId ?? 0, tags ?? Array.Empty<string>(), forceExplicit, dapi, cancel);
-    }
+        => GetNsfwImageAsync(guildId ?? 0, tags ?? Array.Empty<string>(), forceExplicit, dapi, cancel);
 
     private bool IsValidTag(string tag) => tag.All(x => x != '+' && x != '?' && x != '/'); // tags mustn't contain + or ? or /