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/Am/IStorage.cs

@@ -1,26 +1,16 @@
-using Ryujinx.HLE.HOS.Ipc;
-using System.Collections.Generic;
-
 namespace Ryujinx.HLE.HOS.Services.Am
 {
     class IStorage : IpcService
     {
-        private Dictionary<int, ServiceProcessRequest> _commands;
-
-        public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => _commands;
-
         public byte[] Data { get; private set; }
 
         public IStorage(byte[] data)
         {
-            _commands = new Dictionary<int, ServiceProcessRequest>
-            {
-                { 0, Open }
-            };
-
             Data = data;
         }
 
+        [Command(0)]
+        // Open() -> object<nn::am::service::IStorageAccessor>
         public long Open(ServiceCtx context)
         {
             MakeObject(context, new IStorageAccessor(this));