- 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/Gambling/Services/Impl/ShopService.cs

@@ -11,9 +11,7 @@ public class ShopService : IShopService, INService
     private readonly DbService _db;
 
     public ShopService(DbService db)
-    {
-        _db = db;
-    }
+        => _db = db;
 
     private IndexedCollection<ShopEntry> GetEntriesInternal(NadekoContext uow, ulong guildId) =>
         uow.GuildConfigsForId(