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/CommandAttributes.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace Ryujinx.HLE.HOS.Services
+{
+    [AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
+    public class CommandAttribute : Attribute
+    {
+        public readonly int Id;
+
+        public CommandAttribute(int id) => Id = id;
+    }
+}