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

Services/ChannelManager.cs

@@ -7,14 +7,14 @@ namespace HermesSocketServer.Services
 {
     public class ChannelManager
     {
-        private readonly UserStore _users;
+        private readonly IStore<string, User> _users;
         private readonly Database _database;
         private readonly ServerConfiguration _configuration;
         private readonly Serilog.ILogger _logger;
         private readonly IDictionary<string, Channel> _channels;
         private readonly object _lock;
 
-        public ChannelManager(UserStore users, Database database, ServerConfiguration configuration, Serilog.ILogger logger)
+        public ChannelManager(IStore<string, User> users, Database database, ServerConfiguration configuration, Serilog.ILogger logger)
         {
             _users = users;
             _database = database;