Changed the default way to modify values in store. Added basic validation to stores. Using interfaces to DI store objects.

Requests/CreateTTSVoice.cs

@@ -13,7 +13,7 @@ namespace HermesSocketServer.Requests
         private ILogger _logger;
         private Random _random;
 
-        public CreateTTSVoice(VoiceStore voices, ILogger logger)
+        public CreateTTSVoice(IStore<string, TTSVoice> voices, ILogger logger)
         {
             _voices = voices;
             _logger = logger;