Refactoring commands handling (#728)

* Refactoring commands handling

- Use Reflection to handle commands ID.
- Add all symbols (from SwIPC so not all time accurate).
- Re-sort some services commands methods.
- Some cleanup.
- Keep some empty constructor for consistency.

* Fix order in IProfile

Ryujinx.HLE/HOS/Services/DummyService.cs

@@ -1,20 +1,12 @@
-using Ryujinx.HLE.HOS.Ipc;
-using System.Collections.Generic;
-
-namespace Ryujinx.HLE.HOS.Services
+namespace Ryujinx.HLE.HOS.Services
 {
     class DummyService : IpcService
     {
-        private Dictionary<int, ServiceProcessRequest> _commands;
-
-        public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => _commands;
-
         public string ServiceName { get; set; }
 
         public DummyService(string serviceName)
         {
-            _commands = new Dictionary<int, ServiceProcessRequest>();
             ServiceName = serviceName;
         }
     }
-}
+}