* Replacement mechanism reworked

* Services can now register their own replacements
    * Possible bugs and/or backwards-incompatible behavior

src/Nadeko.Bot.Modules.Searches/Crypto/DefaultStockDataService.cs

@@ -6,7 +6,7 @@ using System.Text.Json;
 
 namespace NadekoBot.Modules.Searches;
 
-// todo fix stock/crypto
+// todo fix stock
 public sealed class DefaultStockDataService : IStockDataService, INService
 {
     private readonly IHttpClientFactory _httpClientFactory;
@@ -83,7 +83,6 @@ public sealed class DefaultStockDataService : IStockDataService, INService
         PrepareHeaderForMatch = args => args.Header.Humanize(LetterCasing.Title)
     };
 
-    // todo this needs testing
     public async Task<IReadOnlyCollection<CandleData>> GetCandleDataAsync(string query)
     {
         using var http = _httpClientFactory.CreateClient();