- Started cleanup of command handler

- Removed IUnloadableService
- Started removing INService (removed it from services which implement behavior interfaces) - wip
- Added scrutor for better service registration - wip

src/NadekoBot/Services/INService.cs

@@ -1,6 +1,4 @@
-using System.Threading.Tasks;
-
-namespace NadekoBot.Services
+namespace NadekoBot.Services
 {
     /// <summary>
     /// All services must implement this interface in order to be auto-discovered by the DI system
@@ -9,12 +7,4 @@ namespace NadekoBot.Services
     {
         
     }
-
-    /// <summary>
-    /// All services which require cleanup after they are unloaded must implement this interface
-    /// </summary>
-    public interface IUnloadableService
-    {
-        Task Unload();
-    }
 }