Refactoring HOS folder structure (#771)

* Refactoring HOS folder structure

Refactoring HOS folder structure:

- Added some subfolders when needed (Following structure decided in private).
- Added some `Types` folders when needed.
- Little cleanup here and there.
- Add services placeholders for every HOS services (close #766 and #753).

* Remove Types namespaces

Ryujinx.HLE/HOS/Services/Nifm/StaticService/IRequest.cs

@@ -0,0 +1,90 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Ipc;
+using Ryujinx.HLE.HOS.Kernel.Common;
+using Ryujinx.HLE.HOS.Kernel.Threading;
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService
+{
+    class IRequest : IpcService
+    {
+        private KEvent _event0;
+        private KEvent _event1;
+
+        private uint _version;
+
+        public IRequest(Horizon system, uint version)
+        {
+            _event0 = new KEvent(system);
+            _event1 = new KEvent(system);
+
+            _version = version;
+        }
+
+        [Command(0)]
+        // GetRequestState() -> u32
+        public ResultCode GetRequestState(ServiceCtx context)
+        {
+            context.ResponseData.Write(1);
+
+            Logger.PrintStub(LogClass.ServiceNifm);
+
+            return ResultCode.Success;
+        }
+
+        [Command(1)]
+        // GetResult()
+        public ResultCode GetResult(ServiceCtx context)
+        {
+            Logger.PrintStub(LogClass.ServiceNifm);
+
+            return ResultCode.Success;
+        }
+
+        [Command(2)]
+        // GetSystemEventReadableHandles() -> (handle<copy>, handle<copy>)
+        public ResultCode GetSystemEventReadableHandles(ServiceCtx context)
+        {
+            if (context.Process.HandleTable.GenerateHandle(_event0.ReadableEvent, out int handle0) != KernelResult.Success)
+            {
+                throw new InvalidOperationException("Out of handles!");
+            }
+
+            if (context.Process.HandleTable.GenerateHandle(_event1.ReadableEvent, out int handle1) != KernelResult.Success)
+            {
+                throw new InvalidOperationException("Out of handles!");
+            }
+
+            context.Response.HandleDesc = IpcHandleDesc.MakeCopy(handle0, handle1);
+
+            return ResultCode.Success;
+        }
+
+        [Command(3)]
+        // Cancel()
+        public ResultCode Cancel(ServiceCtx context)
+        {
+            Logger.PrintStub(LogClass.ServiceNifm);
+
+            return ResultCode.Success;
+        }
+
+        [Command(4)]
+        // Submit()
+        public ResultCode Submit(ServiceCtx context)
+        {
+            Logger.PrintStub(LogClass.ServiceNifm);
+
+            return ResultCode.Success;
+        }
+
+        [Command(11)]
+        // SetConnectionConfirmationOption(i8)
+        public ResultCode SetConnectionConfirmationOption(ServiceCtx context)
+        {
+            Logger.PrintStub(LogClass.ServiceNifm);
+
+            return ResultCode.Success;
+        }
+    }
+}