Added and applied styles for private readonly fields, private fields to Extensions and Common folders.

- Some renamings and code cleanups
- Chained method calls, binary expressions and binary patterns will now break into newlines
- Type param constraints and base constructor calls will be on the new line

src/NadekoBot/Modules/Searches/Services/SearchesService.cs

@@ -626,9 +626,7 @@ public class SearchesService : INService
 
         var results = elems.Select(elem =>
             {
-                var anchor = elem.QuerySelector(".result__a") as IHtmlAnchorElement;
-
-                if (anchor is null)
+                if (elem.QuerySelector(".result__a") is not IHtmlAnchorElement anchor)
                     return null;
 
                 var href = anchor.Href;