Updated some namespaces, finished some todos. v5 should be cancelled probably as the code is too intertwined to make it modular

src/NadekoBot/Modules/Gambling/CurrencyProvider.cs

@@ -3,7 +3,6 @@ using NadekoBot.Modules.Gambling.Services;
 
 namespace NadekoBot.Modules.Gambling;
 
-// todo do we need both currencyprovider and currencyservice
 public sealed class CurrencyProvider : ICurrencyProvider, INService
 {
     private readonly GamblingConfigService _cs;